diff --git a/backend/codegen/build.gradle.kts b/backend/codegen/build.gradle.kts
index 574abfe7f..78077df4a 100644
--- a/backend/codegen/build.gradle.kts
+++ b/backend/codegen/build.gradle.kts
@@ -1,8 +1,6 @@
-import org.jetbrains.kotlin.gradle.tasks.KotlinCompile
-
 plugins {
-    id("kotlin")
-    kotlin("plugin.serialization")
+    kotlin("jvm") version "1.4-M2"
+    kotlin("plugin.serialization") version "1.4-M2"
     id("java")
 }
 
@@ -10,8 +8,10 @@ kotlin {
     sourceSets {
         all {
             languageSettings.useExperimentalAnnotation("kotlin.Experimental")
-            languageSettings.useExperimentalAnnotation("kotlin.OptIn")
+            languageSettings.useExperimentalAnnotation("kotlin.RequiresOptIn")
             languageSettings.progressiveMode = true
+            languageSettings.languageVersion = "1.4"
+            languageSettings.apiVersion = "1.4"
             languageSettings.useExperimentalAnnotation("net.mamoe.mirai.utils.MiraiInternalAPI")
             languageSettings.useExperimentalAnnotation("kotlin.ExperimentalUnsignedTypes")
             languageSettings.useExperimentalAnnotation("kotlin.experimental.ExperimentalTypeInference")
@@ -21,21 +21,5 @@ kotlin {
 }
 
 dependencies {
-    api(kotlin("stdlib"))
-}
-
-val compileKotlin: KotlinCompile by tasks
-compileKotlin.kotlinOptions {
-    jvmTarget = "1.8"
-}
-val compileTestKotlin: KotlinCompile by tasks
-compileTestKotlin.kotlinOptions {
-    jvmTarget = "1.8"
-}
-java {
-    sourceCompatibility = JavaVersion.VERSION_1_8
-    targetCompatibility = JavaVersion.VERSION_1_8
-}
-tasks.withType(JavaCompile::class.java) {
-    options.encoding = "UTF8"
+    api(kotlin("stdlib-jdk8"))
 }
\ No newline at end of file
diff --git a/backend/codegen/src/main/kotlin/net/mamoe/mirai/console/codegen/Codegen.kt b/backend/codegen/src/main/kotlin/net/mamoe/mirai/console/codegen/Codegen.kt
new file mode 100644
index 000000000..cc1486ef2
--- /dev/null
+++ b/backend/codegen/src/main/kotlin/net/mamoe/mirai/console/codegen/Codegen.kt
@@ -0,0 +1,98 @@
+/*
+ * Copyright 2020 Mamoe Technologies and contributors.
+ *
+ * 此源代码的使用受 GNU AFFERO GENERAL PUBLIC LICENSE version 3 许可证的约束, 可以在以下链接找到该许可证.
+ * Use of this source code is governed by the GNU AGPLv3 license that can be found through the following link.
+ *
+ * https://github.com/mamoe/mirai/blob/master/LICENSE
+ */
+
+@file:Suppress("FunctionName", "INVISIBLE_MEMBER", "INVISIBLE_REFERENCE")
+
+package net.mamoe.mirai.console.codegen
+
+import org.intellij.lang.annotations.Language
+
+abstract class Replacer(private val name: String) : (String) -> String {
+    override fun toString(): String {
+        return name
+    }
+}
+
+fun Codegen.Replacer(block: (String) -> String): Replacer {
+    return object : Replacer(this@Replacer::class.simpleName ?: "<unnamed>") {
+        override fun invoke(p1: String): String = block(p1)
+    }
+}
+
+class CodegenScope : MutableList<Replacer> by mutableListOf() {
+    fun applyTo(fileContent: String): String {
+        return this.fold(fileContent) { acc, replacer -> replacer(acc) }
+    }
+
+    @CodegenDsl
+    operator fun Codegen.invoke(vararg ktTypes: KtType) {
+        if (ktTypes.isEmpty() && this is DefaultInvoke) {
+            invoke(defaultInvokeArgs)
+        }
+        invoke(ktTypes.toList())
+    }
+
+    @CodegenDsl
+    operator fun Codegen.invoke(ktTypes: Collection<KtType>) {
+        add(Replacer {
+            it + buildString {
+                ktTypes.forEach { applyTo(this, it) }
+            }
+        })
+    }
+
+    @RegionCodegenDsl
+    operator fun RegionCodegen.invoke(vararg ktTypes: KtType) = invoke(ktTypes.toList())
+
+    @RegionCodegenDsl
+    operator fun RegionCodegen.invoke(ktTypes: Collection<KtType>) {
+        add(Replacer {
+            it.replace(Regex("""//// region $regionName CODEGEN ////([\s\S]*?)//// endregion $regionName CODEGEN ////""")) {
+                val code = CodegenScope().apply { (this@invoke as Codegen).invoke(*ktTypes.toTypedArray()) }.applyTo("")
+                """
+                        |//// region $regionName CODEGEN ////
+                        |
+                        |$code
+                        |
+                        |//// endregion $regionName CODEGEN ////
+                    """.trimMargin()
+            }
+        })
+    }
+
+    @DslMarker
+    annotation class CodegenDsl
+}
+
+@DslMarker
+annotation class RegionCodegenDsl
+
+interface DefaultInvoke {
+    val defaultInvokeArgs: List<KtType>
+}
+
+abstract class Codegen {
+    fun applyTo(stringBuilder: StringBuilder, ktType: KtType) = this.run { stringBuilder.apply(ktType) }
+
+    protected abstract fun StringBuilder.apply(ktType: KtType)
+}
+
+abstract class RegionCodegen(regionName: String? = null) : Codegen() {
+    val regionName: String by lazy {
+        regionName ?: this::class.simpleName!!.substringBefore("Codegen")
+    }
+}
+
+abstract class PrimitiveCodegen : Codegen() {
+    protected abstract fun StringBuilder.apply(ktType: KtPrimitive)
+
+    fun StringBuilder.apply(ktType: List<KtPrimitive>) = ktType.forEach { apply(it) }
+}
+
+fun StringBuilder.appendKCode(@Language("kt") ktCode: String): StringBuilder = append(kCode(ktCode)).appendLine()
diff --git a/backend/codegen/src/main/kotlin/net/mamoe/mirai/console/codegen/JSettingCodegen.kt b/backend/codegen/src/main/kotlin/net/mamoe/mirai/console/codegen/JSettingCodegen.kt
index fff3f18ae..885a7e898 100644
--- a/backend/codegen/src/main/kotlin/net/mamoe/mirai/console/codegen/JSettingCodegen.kt
+++ b/backend/codegen/src/main/kotlin/net/mamoe/mirai/console/codegen/JSettingCodegen.kt
@@ -46,35 +46,37 @@ fun JClazz.getTemplate():String = """
 
 fun main(){
     println(buildString {
-        appendln(COPYRIGHT)
-        appendln()
-        appendln(FILE_SUPPRESS)
-        appendln()
-        appendln("/**\n" +
-                " * !!! This file is auto-generated by backend/codegen/src/kotlin/net.mamoe.mirai.console.codegen.JSettingCodegen.kt\n" +
-                " * !!! DO NOT MODIFY THIS FILE MANUALLY\n" +
-                " */\n" +
-                "\"\"\"")
-        appendln()
-        appendln()
+        appendLine(COPYRIGHT)
+        appendLine()
+        appendLine(FILE_SUPPRESS)
+        appendLine()
+        appendLine(
+            "/**\n" +
+                    " * !!! This file is auto-generated by backend/codegen/src/kotlin/net.mamoe.mirai.console.codegen.JSettingCodegen.kt\n" +
+                    " * !!! DO NOT MODIFY THIS FILE MANUALLY\n" +
+                    " */\n" +
+                    "\"\"\""
+        )
+        appendLine()
+        appendLine()
 
 
         //do simplest
         (J_EXTRA + J_NUMBERS).forEach {
-            appendln(it.getTemplate())
+            appendLine(it.getTemplate())
         }
 
         (J_EXTRA + J_NUMBERS).forEach {
-            appendln(JListClazz(it).getTemplate())
+            appendLine(JListClazz(it).getTemplate())
         }
 
         (J_EXTRA + J_NUMBERS).forEach {
-            appendln(JArrayClazz(it).getTemplate())
+            appendLine(JArrayClazz(it).getTemplate())
         }
 
         (J_EXTRA + J_NUMBERS).forEach {key ->
             (J_EXTRA + J_NUMBERS).forEach { value ->
-                appendln(JMapClazz(key, value).getTemplate())
+                appendLine(JMapClazz(key, value).getTemplate())
             }
         }
     })
diff --git a/backend/codegen/src/main/kotlin/net/mamoe/mirai/console/codegen/SettingValueUseSiteCodegen.kt b/backend/codegen/src/main/kotlin/net/mamoe/mirai/console/codegen/SettingValueUseSiteCodegen.kt
index 36af092a4..561bb40c9 100644
--- a/backend/codegen/src/main/kotlin/net/mamoe/mirai/console/codegen/SettingValueUseSiteCodegen.kt
+++ b/backend/codegen/src/main/kotlin/net/mamoe/mirai/console/codegen/SettingValueUseSiteCodegen.kt
@@ -19,19 +19,19 @@ fun main() {
     File("backend/mirai-console/src/main/kotlin/net/mamoe/mirai/console/setting/_Setting.kt").apply {
         createNewFile()
     }.writeText(buildString {
-        appendln(COPYRIGHT)
-        appendln()
-        appendln(FILE_SUPPRESS)
-        appendln()
-        appendln(PACKAGE)
-        appendln()
-        appendln(IMPORTS)
-        appendln()
-        appendln()
-        appendln(DO_NOT_MODIFY)
-        appendln()
-        appendln()
-        appendln(genAllValueUseSite())
+        appendLine(COPYRIGHT)
+        appendLine()
+        appendLine(FILE_SUPPRESS)
+        appendLine()
+        appendLine(PACKAGE)
+        appendLine()
+        appendLine(IMPORTS)
+        appendLine()
+        appendLine()
+        appendLine(DO_NOT_MODIFY)
+        appendLine()
+        appendLine()
+        appendLine(genAllValueUseSite())
     })
 }
 
@@ -56,7 +56,7 @@ import kotlin.internal.LowPriorityInOverloadResolution
 
 fun genAllValueUseSite(): String = buildString {
     fun appendln(@Language("kt") code: String) {
-        this.appendln(code.trimIndent())
+        this.appendLine(code.trimIndent())
     }
     // PRIMITIVE
     for (number in NUMBERS + OTHER_PRIMITIVES) {
@@ -83,7 +83,7 @@ fun genAllValueUseSite(): String = buildString {
     // MUTABLE LIST / MUTABLE SET
     for (collectionName in listOf("List", "Set")) {
         for (number in NUMBERS + OTHER_PRIMITIVES) {
-            appendln()
+            appendLine()
             appendln(
                 """
                 @JvmName("valueMutable")
@@ -94,7 +94,7 @@ fun genAllValueUseSite(): String = buildString {
     }
 
     // SPECIAL
-    appendln()
+    appendLine()
     appendln(
         """
             fun <T : Setting> Setting.value(default: T): Value<T> {
diff --git a/backend/codegen/src/main/kotlin/net/mamoe/mirai/console/codegen/ValueImplCodegen.kt b/backend/codegen/src/main/kotlin/net/mamoe/mirai/console/codegen/ValueImplCodegen.kt
index b4c0014a3..f9e94702f 100644
--- a/backend/codegen/src/main/kotlin/net/mamoe/mirai/console/codegen/ValueImplCodegen.kt
+++ b/backend/codegen/src/main/kotlin/net/mamoe/mirai/console/codegen/ValueImplCodegen.kt
@@ -19,17 +19,17 @@ fun main() {
     File("backend/mirai-console/src/main/kotlin/net/mamoe/mirai/console/setting/internal/_ValueImpl.kt").apply {
         createNewFile()
     }.writeText(buildString {
-        appendln(COPYRIGHT)
-        appendln()
-        appendln(PACKAGE)
-        appendln()
-        appendln(IMPORTS)
-        appendln()
-        appendln()
-        appendln(DO_NOT_MODIFY)
-        appendln()
-        appendln()
-        appendln(genAllValueImpl())
+        appendLine(COPYRIGHT)
+        appendLine()
+        appendLine(PACKAGE)
+        appendLine()
+        appendLine(IMPORTS)
+        appendLine()
+        appendLine()
+        appendLine(DO_NOT_MODIFY)
+        appendLine()
+        appendLine()
+        appendLine(genAllValueImpl())
     })
 }
 
@@ -52,19 +52,19 @@ import net.mamoe.mirai.console.setting.*
 
 fun genAllValueImpl(): String = buildString {
     fun appendln(@Language("kt") code: String) {
-        this.appendln(code.trimIndent())
+        this.appendLine(code.trimIndent())
     }
 
     // PRIMITIVE
     for (number in NUMBERS + OTHER_PRIMITIVES) {
         appendln(genPrimitiveValueImpl(number, number, "$number.serializer()", false))
-        appendln()
+        appendLine()
     }
 
     // PRIMITIVE ARRAYS
     for (number in NUMBERS + OTHER_PRIMITIVES.filterNot { it == "String" }) {
         appendln(genPrimitiveValueImpl("${number}Array", "${number}Array", "${number}ArraySerializer()", true))
-        appendln()
+        appendLine()
     }
 
     // TYPED ARRAYS
@@ -77,7 +77,7 @@ fun genAllValueImpl(): String = buildString {
                 true
             )
         )
-        appendln()
+        appendLine()
     }
 
     // PRIMITIVE LISTS / SETS
@@ -92,11 +92,11 @@ fun genAllValueImpl(): String = buildString {
                     false
                 )
             )
-            appendln()
+            appendLine()
         }
     }
 
-    appendln()
+    appendLine()
 
     // MUTABLE LIST / MUTABLE SET
 
@@ -141,11 +141,11 @@ fun genAllValueImpl(): String = buildString {
                 }
         """
             )
-            appendln()
+            appendLine()
         }
     }
 
-    appendln()
+    appendLine()
 
 
     appendln(
diff --git a/backend/codegen/src/main/kotlin/net/mamoe/mirai/console/codegen/ValueKtCodegen.kt b/backend/codegen/src/main/kotlin/net/mamoe/mirai/console/codegen/ValueKtCodegen.kt
new file mode 100644
index 000000000..5f44ba567
--- /dev/null
+++ b/backend/codegen/src/main/kotlin/net/mamoe/mirai/console/codegen/ValueKtCodegen.kt
@@ -0,0 +1,41 @@
+/*
+ * Copyright 2020 Mamoe Technologies and contributors.
+ *
+ * 此源代码的使用受 GNU AFFERO GENERAL PUBLIC LICENSE version 3 许可证的约束, 可以在以下链接找到该许可证.
+ * Use of this source code is governed by the GNU AGPLv3 license that can be found through the following link.
+ *
+ * https://github.com/mamoe/mirai/blob/master/LICENSE
+ */
+
+package net.mamoe.mirai.console.codegen
+
+
+object ValueKtCodegen {
+    object SettingCodegen {
+        object PrimitiveValuesCodegen : RegionCodegen(), DefaultInvoke {
+            override val defaultInvokeArgs: List<KtType>
+                get() = KtType.Primitives + KtString
+
+            override fun StringBuilder.apply(ktType: KtType) {
+                @Suppress("ClassName")
+                appendKCode(
+                    """
+                    /**
+                     * Represents a non-null [$ktType] value.
+                     */
+                    interface ${ktType}Value : PrimitiveValue<$ktType>
+                """
+                )
+            }
+        }
+
+    }
+
+    @JvmStatic
+    fun main(args: Array<String>) {
+        codegen("Value.kt") {
+            SettingCodegen.PrimitiveValuesCodegen()
+        }
+    }
+}
+
diff --git a/backend/codegen/src/main/kotlin/net/mamoe/mirai/console/codegen/ValuesCodegen.kt b/backend/codegen/src/main/kotlin/net/mamoe/mirai/console/codegen/ValuesCodegen.kt
index 018f7242e..4920d6754 100644
--- a/backend/codegen/src/main/kotlin/net/mamoe/mirai/console/codegen/ValuesCodegen.kt
+++ b/backend/codegen/src/main/kotlin/net/mamoe/mirai/console/codegen/ValuesCodegen.kt
@@ -56,11 +56,11 @@ internal val OTHER_PRIMITIVES = listOf(
 
 fun genPublicApi() = buildString {
     fun appendln(@Language("kt") code: String) {
-        this.appendln(code.trimIndent())
+        this.appendLine(code.trimIndent())
     }
 
     appendln(COPYRIGHT.trim())
-    appendln()
+    appendLine()
     appendln(
         """
             package net.mamoe.mirai.console.setting
@@ -70,7 +70,7 @@ fun genPublicApi() = buildString {
             import kotlin.reflect.KProperty
         """
     )
-    appendln()
+    appendLine()
     appendln(
         """
             /**
@@ -80,7 +80,7 @@ fun genPublicApi() = buildString {
              */
         """
     )
-    appendln()
+    appendLine()
 
     appendln(
         """
@@ -107,7 +107,7 @@ sealed class Value<T : Any> : ReadWriteProperty<Setting, T> {
 }
         """
     )
-    appendln()
+    appendLine()
 
     // PRIMITIVES
 
@@ -127,7 +127,7 @@ sealed class Value<T : Any> : ReadWriteProperty<Setting, T> {
         appendln(template)
     }
 
-    appendln()
+    appendLine()
 
     for (number in OTHER_PRIMITIVES) {
         val template = """
@@ -137,7 +137,7 @@ sealed class Value<T : Any> : ReadWriteProperty<Setting, T> {
         appendln(template)
     }
 
-    appendln()
+    appendLine()
 
     // ARRAYS
 
@@ -154,7 +154,7 @@ sealed class Value<T : Any> : ReadWriteProperty<Setting, T> {
             sealed class PrimitiveArrayValue<T : Any> : ArrayValue<T>()
         """
     )
-    appendln()
+    appendLine()
 
     for (number in (NUMBERS + OTHER_PRIMITIVES).filterNot { it == "String" }) {
         appendln(
@@ -164,10 +164,10 @@ sealed class Value<T : Any> : ReadWriteProperty<Setting, T> {
             }
     """
         )
-        appendln()
+        appendLine()
     }
 
-    appendln()
+    appendLine()
 
     //   TYPED ARRAYS
 
@@ -178,7 +178,7 @@ sealed class Value<T : Any> : ReadWriteProperty<Setting, T> {
             }
     """
     )
-    appendln()
+    appendLine()
 
     for (number in (NUMBERS + OTHER_PRIMITIVES)) {
         appendln(
@@ -188,7 +188,7 @@ sealed class Value<T : Any> : ReadWriteProperty<Setting, T> {
         )
     }
 
-    appendln()
+    appendLine()
 
     //   TYPED LISTS / SETS
     for (collectionName in listOf("List", "Set")) {
@@ -207,14 +207,14 @@ sealed class Value<T : Any> : ReadWriteProperty<Setting, T> {
             appendln(template)
         }
 
-        appendln()
+        appendLine()
         // SETTING
         appendln(
             """
         abstract class Setting${collectionName}Value<T: Setting> internal constructor() : Value<${collectionName}<T>>(), ${collectionName}<T>
     """
         )
-        appendln()
+        appendLine()
     }
 
     // SETTING VALUE
@@ -225,7 +225,7 @@ sealed class Value<T : Any> : ReadWriteProperty<Setting, T> {
         """
     )
 
-    appendln()
+    appendLine()
 
     // MUTABLE LIST / MUTABLE SET
     for (collectionName in listOf("List", "Set")) {
@@ -235,7 +235,7 @@ sealed class Value<T : Any> : ReadWriteProperty<Setting, T> {
     """
         )
 
-        appendln()
+        appendLine()
 
         for (number in (NUMBERS + OTHER_PRIMITIVES)) {
             appendln(
@@ -245,17 +245,17 @@ sealed class Value<T : Any> : ReadWriteProperty<Setting, T> {
             )
         }
 
-        appendln()
+        appendLine()
         // SETTING
         appendln(
             """
         abstract class MutableSetting${collectionName}Value<T: Setting> internal constructor() : Value<Mutable${collectionName}<T>>(), Mutable${collectionName}<T>
     """
         )
-        appendln()
+        appendLine()
     }
 
-    appendln()
+    appendLine()
     // DYNAMIC
 
     appendln(
diff --git a/backend/codegen/src/main/kotlin/net/mamoe/mirai/console/codegen/util.kt b/backend/codegen/src/main/kotlin/net/mamoe/mirai/console/codegen/util.kt
new file mode 100644
index 000000000..241f971cf
--- /dev/null
+++ b/backend/codegen/src/main/kotlin/net/mamoe/mirai/console/codegen/util.kt
@@ -0,0 +1,122 @@
+/*
+ * Copyright 2020 Mamoe Technologies and contributors.
+ *
+ * 此源代码的使用受 GNU AFFERO GENERAL PUBLIC LICENSE version 3 许可证的约束, 可以在以下链接找到该许可证.
+ * Use of this source code is governed by the GNU AGPLv3 license that can be found through the following link.
+ *
+ * https://github.com/mamoe/mirai/blob/master/LICENSE
+ */
+
+@file:Suppress("NOTHING_TO_INLINE", "MemberVisibilityCanBePrivate", "unused")
+
+package net.mamoe.mirai.console.codegen
+
+import org.intellij.lang.annotations.Language
+import java.io.File
+
+
+typealias KtByte = KtType.KtPrimitive.KtByte
+typealias KtShort = KtType.KtPrimitive.KtShort
+typealias KtInt = KtType.KtPrimitive.KtInt
+typealias KtLong = KtType.KtPrimitive.KtLong
+typealias KtFloat = KtType.KtPrimitive.KtFloat
+typealias KtDouble = KtType.KtPrimitive.KtDouble
+typealias KtChar = KtType.KtPrimitive.KtChar
+typealias KtBoolean = KtType.KtPrimitive.KtBoolean
+
+typealias KtString = KtType.KtString
+
+typealias KtCollection = KtType.KtCollection
+typealias KtMap = KtType.KtMap
+
+typealias KtPrimitive = KtType.KtPrimitive
+
+
+sealed class KtType {
+    /**
+     * Its classname in standard library
+     */
+    abstract val standardName: String
+    override fun toString(): String = standardName
+
+    /**
+     * Not Including [String]
+     */
+    sealed class KtPrimitive(
+        override val standardName: String,
+        val jPrimitiveName: String = standardName.toLowerCase(),
+        val jObjectName: String = standardName
+    ) : KtType() {
+        object KtByte : KtPrimitive("Byte")
+        object KtShort : KtPrimitive("Short")
+        object KtInt : KtPrimitive("Int", jObjectName = "Integer")
+        object KtLong : KtPrimitive("Long")
+
+        object KtFloat : KtPrimitive("Float")
+        object KtDouble : KtPrimitive("Double")
+
+        object KtChar : KtPrimitive("Char", jObjectName = "Character")
+        object KtBoolean : KtPrimitive("Boolean")
+    }
+
+    object KtString : KtType() {
+        override val standardName: String get() = "String"
+    }
+
+    /**
+     * [List], [Set]
+     */
+    data class KtCollection(override val standardName: String) : KtType()
+
+    object KtMap : KtType() {
+        override val standardName: String get() = "Map"
+    }
+
+    companion object {
+        val PrimitiveIntegers = listOf(KtByte, KtShort, KtInt, KtLong)
+        val PrimitiveFloatings = listOf(KtFloat, KtDouble)
+
+        val PrimitiveNumbers = PrimitiveIntegers + PrimitiveFloatings
+        val PrimitiveNonNumbers = listOf(KtChar, KtBoolean)
+
+        val Primitives = PrimitiveNumbers + PrimitiveNonNumbers
+    }
+}
+
+operator fun KtType.plus(type: KtType): List<KtType> {
+    return listOf(this, type)
+}
+
+val KtType.lowerCaseName: String get() = this.standardName.toLowerCase()
+
+inline fun kCode(@Language("kt") source: String) = source.trimIndent()
+
+fun codegen(targetFile: String, block: CodegenScope.() -> Unit) {
+    //// region PrimitiveValue CODEGEN ////
+    //// region PrimitiveValue CODEGEN ////
+
+    targetFile.findFileSmart().also {
+        println("Codegen target: ${it.absolutePath}")
+    }.apply {
+        writeText(
+            CodegenScope().apply(block).also { list ->
+                list.forEach {
+                    println("Applying replacement: $it")
+                }
+            }.applyTo(readText())
+        )
+    }
+}
+
+fun String.findFileSmart(): File = kotlin.run {
+    if (contains("/")) { // absolute
+        File(this)
+    } else {
+        val list = File(".").walk().filter { it.name == this }.toList()
+        if (list.isNotEmpty()) return list.single()
+
+        File(".").walk().filter { it.name.contains(this) }.single()
+    }
+}.also {
+    require(it.exists()) { "file doesn't exist" }
+}
\ No newline at end of file
diff --git a/backend/mirai-console/build.gradle.kts b/backend/mirai-console/build.gradle.kts
index 97178d3fe..c04b32633 100644
--- a/backend/mirai-console/build.gradle.kts
+++ b/backend/mirai-console/build.gradle.kts
@@ -1,17 +1,17 @@
+import org.jetbrains.kotlin.gradle.tasks.KotlinCompile
 import upload.Bintray
+import java.text.SimpleDateFormat
 import java.util.*
 
 plugins {
-    id("kotlin")
-    kotlin("plugin.serialization")
+    kotlin("jvm") version Versions.kotlin
+    kotlin("plugin.serialization") version Versions.kotlin
     id("java")
     `maven-publish`
-    id("com.jfrog.bintray")
+    id("com.jfrog.bintray") version Versions.bintray
 }
 
-apply(plugin = "com.github.johnrengelman.shadow")
-
-version = Versions.Mirai.console
+version = Versions.console
 description = "Console backend for mirai"
 
 java {
@@ -56,14 +56,14 @@ kotlin {
 }
 
 dependencies {
-    compileAndRuntime("net.mamoe:mirai-core:${Versions.Mirai.core}")
+    compileAndRuntime("net.mamoe:mirai-core:${Versions.core}")
     compileAndRuntime(kotlin("stdlib"))
 
     api("net.mamoe.yamlkt:yamlkt:0.3.1")
     api("org.jetbrains:annotations:19.0.0")
-    api(kotlinx("coroutines-jdk8", Versions.Kotlin.coroutines))
+    api(kotlinx("coroutines-jdk8", Versions.coroutines))
 
-    testApi("net.mamoe:mirai-core-qqandroid:${Versions.Mirai.core}")
+    testApi("net.mamoe:mirai-core-qqandroid:${Versions.core}")
     testApi(kotlin("stdlib-jdk8"))
     testApi(kotlin("test"))
     testApi(kotlin("test-junit5"))
@@ -76,6 +76,33 @@ tasks {
     "test"(Test::class) {
         useJUnitPlatform()
     }
+
+    val compileKotlin by getting {}
+
+    val fillBuildConstants by registering {
+        doLast {
+            (compileKotlin as KotlinCompile).source.filter { it.name == "MiraiConsole.kt" }.single().let { file ->
+                file.writeText(file.readText()
+                    .replace(Regex("""val buildDate: Date = Date\((.*)\) //(.*)""")) {
+                        """
+                        val buildDate: Date = Date(${System.currentTimeMillis()}L) // ${SimpleDateFormat("yyyy-MM-dd HH:mm:ss").apply {
+                            timeZone = TimeZone.getTimeZone("GMT+8")
+                        }.format(Date())}
+                    """.trimIndent()
+                    }
+                    .replace(Regex("""const val version: String = "(.*)"""")) {
+                        """
+                        const val version: String = "${Versions.console}"
+                    """.trimIndent()
+                    }
+                )
+            }
+        }
+    }
+
+    "compileKotlin" {
+        dependsOn(fillBuildConstants)
+    }
 }
 
 // region PUBLISHING
diff --git a/backend/mirai-console/src/main/java/net/mamoe/mirai/console/command/JCommandManager.java b/backend/mirai-console/src/main/java/net/mamoe/mirai/console/command/JCommandManager.java
index e9e803446..58d922319 100644
--- a/backend/mirai-console/src/main/java/net/mamoe/mirai/console/command/JCommandManager.java
+++ b/backend/mirai-console/src/main/java/net/mamoe/mirai/console/command/JCommandManager.java
@@ -105,10 +105,10 @@ public final class JCommandManager {
      * 解析并执行一个指令
      *
      * @param args 接受 {@link String} 或 {@link Message} , 其他对象将会被 {@link Object#toString()}
-     * @return 是否成功解析到指令. 返回 `false` 代表无任何指令匹配
+     * @see CommandExecuteResult
      * @see #executeCommandAsync(CoroutineScope, CommandSender, Object...)
      */
-    public static boolean executeCommand(final @NotNull CommandSender sender, final @NotNull Object... args) throws InterruptedException {
+    public static CommandExecuteResult executeCommand(final @NotNull CommandSender sender, final @NotNull Object... args) throws InterruptedException {
         Objects.requireNonNull(sender, "sender");
         Objects.requireNonNull(args, "args");
         for (Object arg : args) {
@@ -123,10 +123,10 @@ public final class JCommandManager {
      *
      * @param scope 协程作用域 (用于管理协程生命周期). 一般填入 {@link JavaPlugin} 实例.
      * @param args  接受 {@link String} 或 {@link Message} , 其他对象将会被 {@link Object#toString()}
-     * @return 是否成功解析到指令. 返回 `false` 代表无任何指令匹配
+     * @see CommandExecuteResult
      * @see #executeCommand(CommandSender, Object...)
      */
-    public static CompletableFuture<Boolean> executeCommandAsync(final @NotNull CoroutineScope scope, final @NotNull CommandSender sender, final @NotNull Object... args) {
+    public static CompletableFuture<CommandExecuteResult> executeCommandAsync(final @NotNull CoroutineScope scope, final @NotNull CommandSender sender, final @NotNull Object... args) {
         Objects.requireNonNull(sender, "sender");
         Objects.requireNonNull(args, "args");
         Objects.requireNonNull(scope, "scope");
diff --git a/backend/mirai-console/src/main/kotlin/net/mamoe/mirai/console/MiraiConsole.kt b/backend/mirai-console/src/main/kotlin/net/mamoe/mirai/console/MiraiConsole.kt
index 3669f780f..aa40060db 100644
--- a/backend/mirai-console/src/main/kotlin/net/mamoe/mirai/console/MiraiConsole.kt
+++ b/backend/mirai-console/src/main/kotlin/net/mamoe/mirai/console/MiraiConsole.kt
@@ -13,41 +13,58 @@ import kotlinx.coroutines.CoroutineScope
 import kotlinx.coroutines.Job
 import kotlinx.io.charsets.Charset
 import net.mamoe.mirai.Bot
+import net.mamoe.mirai.console.center.CuiPluginCenter
+import net.mamoe.mirai.console.center.PluginCenter
 import net.mamoe.mirai.console.plugin.PluginLoader
 import net.mamoe.mirai.console.plugin.jvm.JarPluginLoader
-import net.mamoe.mirai.console.plugin.jvm.JvmPlugin
 import net.mamoe.mirai.utils.DefaultLogger
 import net.mamoe.mirai.utils.MiraiExperimentalAPI
 import net.mamoe.mirai.utils.MiraiLogger
 import java.io.ByteArrayOutputStream
 import java.io.File
 import java.io.PrintStream
+import java.util.*
 import kotlin.coroutines.CoroutineContext
 
+internal object MiraiConsoleInitializer {
+    internal lateinit var instance: IMiraiConsole
+
+    /** 由前端调用 */
+    internal fun init(instance: IMiraiConsole) {
+        this.instance = instance
+        MiraiConsole.initialize()
+    }
+
+}
+
+internal object MiraiConsoleBuildConstants { // auto-filled on build (task :mirai-console:fillBuildConstants)
+    @JvmStatic
+    val buildDate: Date = Date(1592799753404L) // 2020-06-22 12:22:33
+    const val version: String = "0.5.1"
+}
+
 /**
  * mirai 控制台实例.
  */
 object MiraiConsole : CoroutineScope, IMiraiConsole {
-    private lateinit var instance: IMiraiConsole
+    val pluginCenter: PluginCenter get() = CuiPluginCenter
 
-    /** 由前端调用 */
-    internal fun init(instance: IMiraiConsole) {
-        this.instance = instance
-    }
+    private val instance: IMiraiConsole
+        get() = MiraiConsoleInitializer.instance
 
     /**
      * `mirai-console` build 号
+     *
+     * UTC+8 时间
      */
-    @MiraiExperimentalAPI
-    override val build: String
-        get() = instance.build
+    @JvmStatic
+    val buildDate: Date
+        get() = MiraiConsoleBuildConstants.buildDate
 
     /**
      * `mirai-console` 版本
      */
-    @MiraiExperimentalAPI
-    override val version: String
-        get() = instance.version
+    const val version: String = MiraiConsoleBuildConstants.version
 
     /**
      * Console 运行路径
@@ -79,14 +96,15 @@ object MiraiConsole : CoroutineScope, IMiraiConsole {
 
     @MiraiExperimentalAPI
     fun newLogger(identity: String?): MiraiLogger = frontEnd.loggerFor(identity)
+
+    internal fun initialize() {
+        // Only for initialize
+    }
 }
 
 
 // 前端使用
 internal interface IMiraiConsole : CoroutineScope {
-    val build: String
-    val version: String
-
     /**
      * Console 运行路径
      */
diff --git a/backend/mirai-console/src/main/kotlin/net/mamoe/mirai/console/MiraiConsoleFrontEnd.kt b/backend/mirai-console/src/main/kotlin/net/mamoe/mirai/console/MiraiConsoleFrontEnd.kt
index f94a8eaea..48043cb76 100644
--- a/backend/mirai-console/src/main/kotlin/net/mamoe/mirai/console/MiraiConsoleFrontEnd.kt
+++ b/backend/mirai-console/src/main/kotlin/net/mamoe/mirai/console/MiraiConsoleFrontEnd.kt
@@ -10,8 +10,6 @@
 package net.mamoe.mirai.console
 
 import net.mamoe.mirai.Bot
-import net.mamoe.mirai.console.center.CuiPluginCenter
-import net.mamoe.mirai.console.center.PluginCenter
 import net.mamoe.mirai.utils.LoginSolver
 import net.mamoe.mirai.utils.MiraiInternalAPI
 import net.mamoe.mirai.utils.MiraiLogger
@@ -22,11 +20,6 @@ import net.mamoe.mirai.utils.MiraiLogger
  */
 @MiraiInternalAPI
 interface MiraiConsoleFrontEnd {
-    /**
-     * 提供 [PluginCenter]
-     */
-    val pluginCenter: PluginCenter get() = CuiPluginCenter
-
     fun loggerFor(identity: String?): MiraiLogger
 
     /**
@@ -43,12 +36,6 @@ interface MiraiConsoleFrontEnd {
         bot: Bot
     )
 
-    fun pushVersion(
-        consoleVersion: String,
-        consoleBuild: String,
-        coreVersion: String
-    )
-
     /**
      * 让 UI 层提供一个输入, 相当于 [readLine]
      */
diff --git a/backend/mirai-console/src/main/kotlin/net/mamoe/mirai/console/command/CommandManager.kt b/backend/mirai-console/src/main/kotlin/net/mamoe/mirai/console/command/CommandManager.kt
index 2a5cca566..56d980cda 100644
--- a/backend/mirai-console/src/main/kotlin/net/mamoe/mirai/console/command/CommandManager.kt
+++ b/backend/mirai-console/src/main/kotlin/net/mamoe/mirai/console/command/CommandManager.kt
@@ -134,12 +134,14 @@ fun Command.unregister(): Boolean = InternalCommandManager.modifyLock.withLock {
  * Java 调用方式: `<static> CommandManager.executeCommand(Command)`
  *
  * @param messages 接受 [String] 或 [Message], 其他对象将会被 [Any.toString]
- * @return 是否成功解析到指令. 返回 `false` 代表无任何指令匹配
+ * @see CommandExecuteResult
  *
  * @see JCommandManager.executeCommand Java 方法
  */
-suspend fun CommandSender.executeCommand(vararg messages: Any): Boolean {
-    if (messages.isEmpty()) return false
+suspend fun CommandSender.executeCommand(vararg messages: Any): CommandExecuteResult {
+    if (messages.isEmpty()) return CommandExecuteResult(
+        status = CommandExecuteStatus.EMPTY_COMMAND
+    )
     return executeCommandInternal(
         messages,
         messages[0].let { if (it is SingleMessage) it.toString() else it.toString().substringBefore(' ') })
@@ -150,12 +152,14 @@ internal inline fun <reified T> List<T>.dropToTypedArray(n: Int): Array<T> = Arr
 
 /**
  * 解析并执行一个指令
- * @return 是否成功解析到指令. 返回 `false` 代表无任何指令匹配
+ * @see CommandExecuteResult
  *
  * @see JCommandManager.executeCommand Java 方法
  */
-suspend fun CommandSender.executeCommand(message: MessageChain): Boolean {
-    if (message.isEmpty()) return false
+suspend fun CommandSender.executeCommand(message: MessageChain): CommandExecuteResult {
+    if (message.isEmpty()) return CommandExecuteResult(
+        status = CommandExecuteStatus.EMPTY_COMMAND
+    )
     return executeCommandInternal(message, message[0].toString())
 }
 
@@ -163,9 +167,63 @@ suspend fun CommandSender.executeCommand(message: MessageChain): Boolean {
 internal suspend inline fun CommandSender.executeCommandInternal(
     messages: Any,
     commandName: String
-): Boolean {
-    val command = InternalCommandManager.matchCommand(commandName) ?: return false
+): CommandExecuteResult {
+    val command = InternalCommandManager.matchCommand(commandName) ?: return CommandExecuteResult(
+        status = CommandExecuteStatus.COMMAND_NOT_FOUND,
+        commandName = commandName
+    )
     val rawInput = messages.flattenCommandComponents()
-    command.onCommand(this, rawInput.dropToTypedArray(1))
-    return true
-}
\ No newline at end of file
+    kotlin.runCatching {
+        command.onCommand(this, rawInput.dropToTypedArray(1))
+    }.onFailure {
+        return CommandExecuteResult(
+            status = CommandExecuteStatus.FAILED,
+            commandName = commandName,
+            command = command,
+            exception = it
+        )
+    }
+    return CommandExecuteResult(
+        status = CommandExecuteStatus.SUCCESSFUL,
+        commandName = commandName,
+        command = command
+    )
+}
+
+/**
+ * 命令的执行返回
+ *
+ * @param status 命令最终执行状态
+ * @param exception 命令执行时发生的错误(如果有)
+ * @param command 尝试执行的命令 (status = SUCCESSFUL | FAILED)
+ * @param commandName 尝试执行的命令的名字 (status != EMPTY_COMMAND)
+ *
+ *
+ * @see CommandExecuteStatus
+ */
+class CommandExecuteResult(
+    val status: CommandExecuteStatus,
+    val exception: Throwable? = null,
+    val command: Command? = null,
+    val commandName: String? = null
+) {
+    /**
+     * 命令的执行状态
+     *
+     * 当为 [SUCCESSFUL] 的时候，代表命令执行成功
+     *
+     * 当为 [FAILED] 的时候, 代表命令执行出现了错误
+     *
+     * 当为 [COMMAND_NOT_FOUND] 的时候，代表没有匹配的命令
+     *
+     * 当为 [EMPTY_COMMAND] 的时候, 代表尝试执行 ""
+     *
+     */
+    enum class CommandExecuteStatus {
+        SUCCESSFUL, FAILED, COMMAND_NOT_FOUND, EMPTY_COMMAND
+    }
+
+}
+
+@Suppress("RemoveRedundantQualifierName")
+typealias CommandExecuteStatus = CommandExecuteResult.CommandExecuteStatus
diff --git a/backend/mirai-console/src/main/kotlin/net/mamoe/mirai/console/plugin/internal/PluginsLoader.kt b/backend/mirai-console/src/main/kotlin/net/mamoe/mirai/console/plugin/internal/PluginsLoader.kt
index 848cf4dfd..a9a3d9f85 100644
--- a/backend/mirai-console/src/main/kotlin/net/mamoe/mirai/console/plugin/internal/PluginsLoader.kt
+++ b/backend/mirai-console/src/main/kotlin/net/mamoe/mirai/console/plugin/internal/PluginsLoader.kt
@@ -16,7 +16,7 @@ import java.net.URLClassLoader
 internal class PluginsLoader(private val parentClassLoader: ClassLoader) {
     private val loggerName = "PluginsLoader"
     private val pluginLoaders = linkedMapOf<String, PluginClassLoader>()
-    private val classesCache = mutableMapOf<String,Class<*>>()
+    private val classesCache = mutableMapOf<String, Class<*>>()
     private val logger = MiraiConsole.newLogger(loggerName)
 
     /**
@@ -34,7 +34,7 @@ internal class PluginsLoader(private val parentClassLoader: ClassLoader) {
             } catch (e: Throwable) {
                 logger.error("Plugin(${plugin.key}) can't not close its ClassLoader(${cl})", e)
             }
-        } 
+        }
         classesCache.clear()
     }
 
@@ -93,9 +93,9 @@ internal class PluginsLoader(private val parentClassLoader: ClassLoader) {
  * A Adapted URL Class Loader that supports Android and JVM for single URL(File) Class Load
  */
 
-internal open class AdaptiveURLClassLoader(file: File, parent: ClassLoader):ClassLoader(){
+internal open class AdaptiveURLClassLoader(file: File, parent: ClassLoader) : ClassLoader() {
 
-    private val internalClassLoader:ClassLoader by lazy {
+    private val internalClassLoader: ClassLoader by lazy {
         kotlin.runCatching {
             val loaderClass = Class.forName("dalvik.system.PathClassLoader")
             loaderClass.getConstructor(String::class.java, ClassLoader::class.java)
@@ -110,19 +110,19 @@ internal open class AdaptiveURLClassLoader(file: File, parent: ClassLoader):Clas
     }
 
 
-    private val internalClassCache = mutableMapOf<String,Class<*>>()
+    private val internalClassCache = mutableMapOf<String, Class<*>>()
 
-    internal val classesCache:Map<String,Class<*>>
+    internal val classesCache: Map<String, Class<*>>
         get() = internalClassCache
 
-    internal fun addClassCache(string: String, clazz: Class<*>){
-        synchronized(internalClassCache){
+    internal fun addClassCache(string: String, clazz: Class<*>) {
+        synchronized(internalClassCache) {
             internalClassCache[string] = clazz
         }
     }
 
 
-    fun close(){
+    fun close() {
         if (internalClassLoader is URLClassLoader) {
             (internalClassLoader as URLClassLoader).close()
         }
@@ -135,24 +135,25 @@ internal class PluginClassLoader(
     file: File,
     private val pluginsLoader: PluginsLoader,
     parent: ClassLoader
-) :AdaptiveURLClassLoader(file,parent){
+) : AdaptiveURLClassLoader(file, parent) {
 
     override fun findClass(name: String): Class<*> {
-        return findClass(name,true)
+        return findClass(name, true)
     }
 
-    fun findClass(name: String, global: Boolean = true): Class<*>{
-        return classesCache[name]?: kotlin.run {
+    fun findClass(name: String, global: Boolean = true): Class<*> {
+        return classesCache[name] ?: kotlin.run {
             var clazz: Class<*>? = null
             if (global) {
                 clazz = pluginsLoader.findClassByName(name)
             }
-            if(clazz == null) {
+            if (clazz == null) {
                 clazz = loadClass(name)//这里应该是find, 如果不行就要改
             }
             pluginsLoader.addClassCache(name, clazz)
-            this.addClassCache(name, clazz)  
-            clazz
+            this.addClassCache(name, clazz)
+            @Suppress("UNNECESSARY_NOT_NULL_ASSERTION")
+            clazz!! // compiler bug
         }
     }
 }
diff --git a/backend/mirai-console/src/main/kotlin/net/mamoe/mirai/console/setting/Setting.kt b/backend/mirai-console/src/main/kotlin/net/mamoe/mirai/console/setting/Setting.kt
new file mode 100644
index 000000000..8999c61c5
--- /dev/null
+++ b/backend/mirai-console/src/main/kotlin/net/mamoe/mirai/console/setting/Setting.kt
@@ -0,0 +1,86 @@
+/*
+ * Copyright 2020 Mamoe Technologies and contributors.
+ *
+ * 此源代码的使用受 GNU AFFERO GENERAL PUBLIC LICENSE version 3 许可证的约束, 可以在以下链接找到该许可证.
+ * Use of this source code is governed by the GNU AGPLv3 license that can be found through the following link.
+ *
+ * https://github.com/mamoe/mirai/blob/master/LICENSE
+ */
+
+@file:Suppress("INVISIBLE_REFERENCE", "INVISIBLE_MEMBER", "EXPOSED_SUPER_CLASS")
+
+package net.mamoe.mirai.console.setting
+
+import kotlinx.serialization.KSerializer
+import net.mamoe.mirai.console.setting.internal.cast
+import net.mamoe.mirai.console.setting.internal.valueFromKTypeImpl
+import net.mamoe.mirai.console.setting.internal.valueImpl
+import net.mamoe.mirai.utils.MiraiExperimentalAPI
+import java.util.*
+import kotlin.internal.LowPriorityInOverloadResolution
+import kotlin.reflect.KProperty
+import kotlin.reflect.KType
+import kotlin.reflect.typeOf
+
+
+// TODO: 2020/6/21 move to JvmPlugin to inherit SettingStorage and CoroutineScope for saving
+// Shows public APIs such as deciding when to auto-save.
+abstract class Setting : SettingImpl() {
+
+    operator fun <T> SerializerAwareValue<T>.provideDelegate(
+        thisRef: Any?,
+        property: KProperty<*>
+    ): SerializerAwareValue<T> {
+        @Suppress("UNCHECKED_CAST")
+        valueNodes.add(Node(property as KProperty<T>, this, this.serializer))
+        return this
+    }
+}
+
+/**
+ * Internal implementation for [Setting] including:
+ * - Reflection on Kotlin properties and Java fields
+ * - Auto-saving
+ */
+// TODO move to internal package.
+internal abstract class SettingImpl {
+    internal class Node<T>(
+        val property: KProperty<T>,
+        val value: Value<T>,
+        val updaterSerializer: KSerializer<Unit>
+    )
+
+    internal val valueNodes: MutableList<Node<*>> = Collections.synchronizedList(mutableListOf())
+
+    /**
+     * flatten
+     */
+    internal fun onValueChanged(value: Value<*>) {
+        // TODO: 2020/6/22
+    }
+}
+
+
+//// region Setting.value primitives CODEGEN ////
+
+// TODO: 2020/6/19 CODEGEN
+
+fun Setting.value(default: Int): SerializableValue<Int> = valueImpl(default)
+
+//// endregion Setting.value primitives CODEGEN ////
+
+
+/**
+ * Creates a [Value] with reified type.
+ *
+ * @param T reified param type T.
+ * Supports only primitives, Kotlin built-in collections,
+ * and classes that are serializable with Kotlinx.serialization
+ * (typically annotated with [kotlinx.serialization.Serializable])
+ */
+@LowPriorityInOverloadResolution
+@OptIn(ExperimentalStdlibApi::class) // stable in 1.4
+inline fun <reified T> Setting.valueReified(default: T): SerializableValue<T> = valueFromKTypeImpl(typeOf<T>()).cast()
+
+@MiraiExperimentalAPI
+fun <T> Setting.valueFromKType(type: KType): SerializableValue<T> = valueFromKTypeImpl(type).cast()
\ No newline at end of file
diff --git a/backend/mirai-console/src/main/kotlin/net/mamoe/mirai/console/setting/Value.kt b/backend/mirai-console/src/main/kotlin/net/mamoe/mirai/console/setting/Value.kt
new file mode 100644
index 000000000..7a3d7b6e4
--- /dev/null
+++ b/backend/mirai-console/src/main/kotlin/net/mamoe/mirai/console/setting/Value.kt
@@ -0,0 +1,216 @@
+/*
+ * Copyright 2020 Mamoe Technologies and contributors.
+ *
+ * 此源代码的使用受 GNU AFFERO GENERAL PUBLIC LICENSE version 3 许可证的约束, 可以在以下链接找到该许可证.
+ * Use of this source code is governed by the GNU AGPLv3 license that can be found through the following link.
+ *
+ * https://github.com/mamoe/mirai/blob/master/LICENSE
+ */
+
+@file:Suppress("INVISIBLE_REFERENCE", "INVISIBLE_MEMBER", "unused", "NOTHING_TO_INLINE")
+
+package net.mamoe.mirai.console.setting
+
+import kotlinx.serialization.KSerializer
+import net.mamoe.mirai.console.setting.internal.map
+import net.mamoe.mirai.utils.MiraiExperimentalAPI
+import kotlin.reflect.KProperty
+
+/**
+ * Represents a observable, immutable value wrapping.
+ *
+ * The value can be modified by delegation just like Kotlin's `var`, however it can also be done by the user, e.g. changing using the UI frontend.
+ *
+ * Some frequently used types are specially treated with performance enhancement by codegen.
+ *
+ * @see PrimitiveValue
+ * @see CompositeValue
+ */
+interface Value<T> {
+    var value: T
+}
+
+/**
+ * Typically returned by [Setting.value] functions.
+ */
+class SerializableValue<T>(
+    delegate: Value<T>,
+    /**
+     * The serializer used to update and dump [delegate]
+     */
+    override val serializer: KSerializer<Unit>
+) : Value<T> by delegate, SerializerAwareValue<T>
+
+fun <T> Value<T>.serializableValueWith(
+    serializer: KSerializer<T>
+): SerializableValue<T> {
+    return SerializableValue(this, serializer.map(serializer = { this.value }, deserializer = { this.value = it }))
+}
+
+/**
+ * @see SerializableValue
+ */
+interface SerializerAwareValue<T> : Value<T> {
+    val serializer: KSerializer<Unit>
+}
+
+inline operator fun <T> Value<T>.getValue(mySetting: Any?, property: KProperty<*>): T = value
+inline operator fun <T> Value<T>.setValue(mySetting: Any?, property: KProperty<*>, value: T) {
+    this.value = value
+}
+
+/**
+ * The serializer for a specific kind of [Value].
+ */
+typealias ValueSerializer<T> = KSerializer<Value<T>>
+
+/**
+ * Represents a observable *primitive* value wrapping.
+ *
+ * 9 types that are considered *primitive*:
+ * - Integers: [Byte], [Short], [Int], [Long]
+ * - Floating: [Float], [Double]
+ * - [Boolean]
+ * - [Char], [String]
+ *
+ * Note: The values are actually *boxed* because of the generic type T.
+ * *Primitive* indicates only it is one of the 9 types mentioned above.
+ */
+interface PrimitiveValue<T> : Value<T>
+
+
+//// region PrimitiveValues CODEGEN ////
+
+/**
+ * Represents a non-null [Byte] value.
+ */
+interface ByteValue : PrimitiveValue<Byte>
+
+/**
+ * Represents a non-null [Short] value.
+ */
+interface ShortValue : PrimitiveValue<Short>
+
+/**
+ * Represents a non-null [Int] value.
+ */
+interface IntValue : PrimitiveValue<Int>
+
+/**
+ * Represents a non-null [Long] value.
+ */
+interface LongValue : PrimitiveValue<Long>
+
+/**
+ * Represents a non-null [Float] value.
+ */
+interface FloatValue : PrimitiveValue<Float>
+
+/**
+ * Represents a non-null [Double] value.
+ */
+interface DoubleValue : PrimitiveValue<Double>
+
+/**
+ * Represents a non-null [Char] value.
+ */
+interface CharValue : PrimitiveValue<Char>
+
+/**
+ * Represents a non-null [Boolean] value.
+ */
+interface BooleanValue : PrimitiveValue<Boolean>
+
+/**
+ * Represents a non-null [String] value.
+ */
+interface StringValue : PrimitiveValue<String>
+
+
+//// endregion PrimitiveValues CODEGEN ////
+
+
+@MiraiExperimentalAPI
+interface CompositeValue<T> : Value<T>
+
+
+/**
+ * Superclass of [CompositeListValue], [PrimitiveListValue].
+ */
+interface ListValue<E> : CompositeValue<List<E>>
+
+/**
+ * Elements can by anything, wrapped as [Value].
+ * @param E is not primitive types.
+ */
+interface CompositeListValue<E> : ListValue<E>
+
+/**
+ * Elements can only be primitives, not wrapped.
+ * @param E is not primitive types.
+ */
+interface PrimitiveListValue<E> : ListValue<E>
+
+
+//// region PrimitiveListValue CODEGEN ////
+
+interface PrimitiveIntListValue : PrimitiveListValue<Int>
+interface PrimitiveLongListValue : PrimitiveListValue<Long>
+// TODO + codegen
+
+//// endregion PrimitiveListValue CODEGEN ////
+
+
+/**
+ * Superclass of [CompositeSetValue], [PrimitiveSetValue].
+ */
+interface SetValue<E> : CompositeValue<Set<E>>
+
+/**
+ * Elements can by anything, wrapped as [Value].
+ * @param E is not primitive types.
+ */
+interface CompositeSetValue<E> : SetValue<E>
+
+/**
+ * Elements can only be primitives, not wrapped.
+ * @param E is not primitive types.
+ */
+interface PrimitiveSetValue<E> : SetValue<E>
+
+
+//// region PrimitiveSetValue CODEGEN ////
+
+interface PrimitiveIntSetValue : PrimitiveSetValue<Int>
+interface PrimitiveLongSetValue : PrimitiveSetValue<Long>
+// TODO + codegen
+
+//// endregion PrimitiveSetValue CODEGEN ////
+
+
+/**
+ * Superclass of [CompositeMapValue], [PrimitiveMapValue].
+ */
+interface MapValue<K, V> : CompositeValue<Map<K, V>>
+
+interface CompositeMapValue<K, V> : MapValue<K, V>
+
+interface PrimitiveMapValue<K, V> : MapValue<K, V>
+
+
+//// region PrimitiveMapValue CODEGEN ////
+
+interface PrimitiveIntIntMapValue : PrimitiveMapValue<Int, Int>
+interface PrimitiveIntLongMapValue : PrimitiveMapValue<Int, Long>
+// TODO + codegen
+
+//// endregion PrimitiveSetValue CODEGEN ////
+
+
+
+
+
+
+
+
+
diff --git a/backend/mirai-console/src/main/kotlin/net/mamoe/mirai/console/setting/internal/CompositeValueImpl.kt b/backend/mirai-console/src/main/kotlin/net/mamoe/mirai/console/setting/internal/CompositeValueImpl.kt
new file mode 100644
index 000000000..1b611fe9d
--- /dev/null
+++ b/backend/mirai-console/src/main/kotlin/net/mamoe/mirai/console/setting/internal/CompositeValueImpl.kt
@@ -0,0 +1,104 @@
+/*
+ * Copyright 2020 Mamoe Technologies and contributors.
+ *
+ * 此源代码的使用受 GNU AFFERO GENERAL PUBLIC LICENSE version 3 许可证的约束, 可以在以下链接找到该许可证.
+ * Use of this source code is governed by the GNU AGPLv3 license that can be found through the following link.
+ *
+ * https://github.com/mamoe/mirai/blob/master/LICENSE
+ */
+
+@file:Suppress("unused")
+
+package net.mamoe.mirai.console.setting.internal
+
+import net.mamoe.mirai.console.setting.*
+
+
+// type inference bug
+internal fun <T> Setting.createCompositeSetValueImpl(tToValue: (T) -> Value<T>): CompositeSetValueImpl<T> {
+    return object : CompositeSetValueImpl<T>(tToValue) {
+        override fun onChanged() {
+            this@createCompositeSetValueImpl.onValueChanged(this)
+        }
+    }
+}
+
+internal abstract class CompositeSetValueImpl<T>(
+    tToValue: (T) -> Value<T> // should override onChanged
+) : CompositeSetValue<T> {
+    private val internalSet: MutableSet<Value<T>> = mutableSetOf()
+
+    private var _value: Set<T> = internalSet.shadowMap({ it.value }, tToValue).observable { onChanged() }
+
+    override var value: Set<T>
+        get() = _value
+        set(v) {
+            if (_value != v) {
+                onChanged()
+                _value = v
+            }
+        }
+
+    protected abstract fun onChanged()
+}
+
+
+// type inference bug
+internal fun <T> Setting.createCompositeListValueImpl(tToValue: (T) -> Value<T>): CompositeListValueImpl<T> {
+    return object : CompositeListValueImpl<T>(tToValue) {
+        override fun onChanged() {
+            this@createCompositeListValueImpl.onValueChanged(this)
+        }
+    }
+}
+
+internal abstract class CompositeListValueImpl<T>(
+    tToValue: (T) -> Value<T> // should override onChanged
+) : CompositeListValue<T> {
+    private val internalList: MutableList<Value<T>> = mutableListOf()
+
+    private var _value: List<T> = internalList.shadowMap({ it.value }, tToValue).observable { onChanged() }
+
+    override var value: List<T>
+        get() = _value
+        set(v) {
+            if (_value != v) {
+                onChanged()
+                _value = v
+            }
+        }
+
+    protected abstract fun onChanged()
+}
+
+// workaround to a type inference bug
+internal fun <K, V> Setting.createCompositeMapValueImpl(
+    kToValue: (K) -> Value<K>,
+    vToValue: (V) -> Value<V>
+): CompositeMapValueImpl<K, V> {
+    return object : CompositeMapValueImpl<K, V>(kToValue, vToValue) {
+        override fun onChanged() {
+            this@createCompositeMapValueImpl.onValueChanged(this)
+        }
+    }
+}
+
+internal abstract class CompositeMapValueImpl<K, V>(
+    kToValue: (K) -> Value<K>, // should override onChanged
+    vToValue: (V) -> Value<V> // should override onChanged
+) : CompositeMapValue<K, V> {
+    private val internalList: MutableMap<Value<K>, Value<V>> = mutableMapOf()
+
+    private var _value: Map<K, V> =
+        internalList.shadowMap({ it.value }, kToValue, { it.value }, vToValue).observable { onChanged() }
+    override var value: Map<K, V>
+        get() = _value
+        set(v) {
+            if (_value != v) {
+                onChanged()
+                _value = v
+            }
+        }
+
+    protected abstract fun onChanged()
+}
\ No newline at end of file
diff --git a/backend/mirai-console/src/main/kotlin/net/mamoe/mirai/console/setting/internal/Setting.value composite impl.kt b/backend/mirai-console/src/main/kotlin/net/mamoe/mirai/console/setting/internal/Setting.value composite impl.kt
new file mode 100644
index 000000000..83f29ea69
--- /dev/null
+++ b/backend/mirai-console/src/main/kotlin/net/mamoe/mirai/console/setting/internal/Setting.value composite impl.kt	
@@ -0,0 +1,151 @@
+/*
+ * Copyright 2020 Mamoe Technologies and contributors.
+ *
+ * 此源代码的使用受 GNU AFFERO GENERAL PUBLIC LICENSE version 3 许可证的约束, 可以在以下链接找到该许可证.
+ * Use of this source code is governed by the GNU AGPLv3 license that can be found through the following link.
+ *
+ * https://github.com/mamoe/mirai/blob/master/LICENSE
+ */
+
+@file:Suppress("NOTHING_TO_INLINE")
+
+package net.mamoe.mirai.console.setting.internal
+
+import kotlinx.serialization.*
+import kotlinx.serialization.builtins.*
+import net.mamoe.mirai.console.setting.SerializableValue
+import net.mamoe.mirai.console.setting.Setting
+import net.mamoe.mirai.console.setting.serializableValueWith
+import net.mamoe.mirai.console.setting.valueFromKType
+import net.mamoe.yamlkt.YamlDynamicSerializer
+import net.mamoe.yamlkt.YamlNullableDynamicSerializer
+import kotlin.reflect.KClass
+import kotlin.reflect.KType
+
+
+@PublishedApi
+@Suppress("UnsafeCall", "SMARTCAST_IMPOSSIBLE", "UNCHECKED_CAST")
+internal fun Setting.valueFromKTypeImpl(type: KType): SerializableValue<*> {
+    val classifier = type.classifier
+    require(classifier is KClass<*>)
+
+    if (classifier.isPrimitiveOrBuiltInSerializableValue()) {
+        TODO("是基础类型, 可以直接创建 ValueImpl. ")
+    }
+
+    // 复合类型
+
+    when (classifier) {
+        Map::class -> {
+            val keyClass = type.arguments[0].type?.classifier
+            require(keyClass is KClass<*>)
+
+            val valueClass = type.arguments[1].type?.classifier
+            require(valueClass is KClass<*>)
+
+            if (keyClass.isPrimitiveOrBuiltInSerializableValue() && valueClass.isPrimitiveOrBuiltInSerializableValue()) {
+                // PrimitiveIntIntMap
+                // ...
+                TODO()
+            } else {
+                return createCompositeMapValueImpl<Any?, Any?>(
+                    kToValue = { valueFromKType(type.arguments[0].type!!) },
+                    vToValue = { valueFromKType(type.arguments[1].type!!) }
+                ).serializableValueWith(serializerMirai(type) as KSerializer<Map<Any?, Any?>>) // erased
+            }
+        }
+        List::class -> {
+            val elementClass = type.arguments[0].type?.classifier
+            require(elementClass is KClass<*>)
+
+            if (elementClass.isPrimitiveOrBuiltInSerializableValue()) {
+                // PrimitiveIntList
+                // ...
+                TODO()
+            } else {
+                return createCompositeListValueImpl<Any?> { valueFromKType(type.arguments[0].type!!) }
+                    .serializableValueWith(serializerMirai(type) as KSerializer<List<Any?>>)
+            }
+        }
+        Set::class -> {
+            val elementClass = type.arguments[0].type?.classifier
+            require(elementClass is KClass<*>)
+
+            if (elementClass.isPrimitiveOrBuiltInSerializableValue()) {
+                // PrimitiveIntSet
+                // ...
+                TODO()
+            } else {
+                return createCompositeSetValueImpl<Any?> { valueFromKType(type.arguments[0].type!!) }
+                    .serializableValueWith(serializerMirai(type) as KSerializer<Set<Any?>>)
+            }
+        }
+        else -> error("Custom composite value is not supported yet (${classifier.qualifiedName})")
+    }
+}
+
+internal fun KClass<*>.isPrimitiveOrBuiltInSerializableValue(): Boolean {
+    return false // debug
+    when (this) {
+        Byte::class, Short::class, Int::class, Long::class,
+        Boolean::class,
+        Char::class, String::class,
+        Pair::class, Triple::class
+        -> return true
+    }
+
+    return false
+}
+
+@PublishedApi
+@Suppress("UNCHECKED_CAST")
+internal inline fun <R, T> T.cast(): R = this as R
+
+/**
+ * Copied from kotlinx.serialization, modifications are marked with "/* mamoe modify */"
+ * Copyright 2017-2020 JetBrains s.r.o.
+ */
+@Suppress("UNCHECKED_CAST", "NO_REFLECTION_IN_CLASS_PATH", "UNSUPPORTED", "INVISIBLE_MEMBER", "INVISIBLE_REFERENCE")
+@OptIn(ImplicitReflectionSerializer::class)
+internal fun serializerMirai(type: KType): KSerializer<Any?> {
+    fun serializerByKTypeImpl(type: KType): KSerializer<Any> {
+        val rootClass = when (val t = type.classifier) {
+            is KClass<*> -> t
+            else -> error("Only KClass supported as classifier, got $t")
+        } as KClass<Any>
+
+        val typeArguments = type.arguments
+            .map { requireNotNull(it.type) { "Star projections are not allowed, had $it instead" } }
+        return when {
+            typeArguments.isEmpty() -> rootClass.serializer()
+            else -> {
+                val serializers = typeArguments
+                    .map(::serializer)
+                // Array is not supported, see KT-32839
+                when (rootClass) {
+                    List::class, MutableList::class, ArrayList::class -> ListSerializer(serializers[0])
+                    HashSet::class -> SetSerializer(serializers[0])
+                    Set::class, MutableSet::class, LinkedHashSet::class -> SetSerializer(serializers[0])
+                    HashMap::class -> MapSerializer(serializers[0], serializers[1])
+                    Map::class, MutableMap::class, LinkedHashMap::class -> MapSerializer(serializers[0], serializers[1])
+                    Map.Entry::class -> MapEntrySerializer(serializers[0], serializers[1])
+                    Pair::class -> PairSerializer(serializers[0], serializers[1])
+                    Triple::class -> TripleSerializer(serializers[0], serializers[1], serializers[2])
+                    /* mamoe modify */ Any::class -> if (type.isMarkedNullable) YamlNullableDynamicSerializer else YamlDynamicSerializer
+                    else -> {
+                        if (isReferenceArray(type, rootClass)) {
+                            return ArraySerializer(typeArguments[0].classifier as KClass<Any>, serializers[0]).cast()
+                        }
+                        requireNotNull(rootClass.constructSerializerForGivenTypeArgs(*serializers.toTypedArray())) {
+                            "Can't find a method to construct serializer for type ${rootClass.simpleName()}. " +
+                                    "Make sure this class is marked as @Serializable or provide serializer explicitly."
+                        }
+                    }
+                }
+            }
+        }.cast()
+    }
+
+    val result = serializerByKTypeImpl(type)
+    return if (type.isMarkedNullable) result.nullable else result.cast()
+}
diff --git a/backend/mirai-console/src/main/kotlin/net/mamoe/mirai/console/setting/internal/_PrimitiveValueDeclareations.kt b/backend/mirai-console/src/main/kotlin/net/mamoe/mirai/console/setting/internal/_PrimitiveValueDeclareations.kt
new file mode 100644
index 000000000..650200b97
--- /dev/null
+++ b/backend/mirai-console/src/main/kotlin/net/mamoe/mirai/console/setting/internal/_PrimitiveValueDeclareations.kt
@@ -0,0 +1,39 @@
+/*
+ * Copyright 2020 Mamoe Technologies and contributors.
+ *
+ * 此源代码的使用受 GNU AFFERO GENERAL PUBLIC LICENSE version 3 许可证的约束, 可以在以下链接找到该许可证.
+ * Use of this source code is governed by the GNU AGPLv3 license that can be found through the following link.
+ *
+ * https://github.com/mamoe/mirai/blob/master/LICENSE
+ */
+
+package net.mamoe.mirai.console.setting.internal
+
+import net.mamoe.mirai.console.setting.IntValue
+
+
+//// region PrimitiveValues CODEGEN ////
+
+// TODO: 2020/6/21 CODEGEN
+
+internal abstract class IntValueImpl : IntValue {
+    constructor()
+    constructor(default: Int) {
+        _value = default
+    }
+
+    private var _value: Int? = null
+
+    override var value: Int
+        get() = _value ?: throw IllegalStateException("IntValue should be initialized before get.")
+        set(v) {
+            if (v != this._value) {
+                this._value = v
+                onChanged()
+            }
+        }
+
+    protected abstract fun onChanged()
+}
+
+//// endregion PrimitiveValues CODEGEN ////
diff --git a/backend/mirai-console/src/main/kotlin/net/mamoe/mirai/console/setting/internal/_Setting.value.kt b/backend/mirai-console/src/main/kotlin/net/mamoe/mirai/console/setting/internal/_Setting.value.kt
new file mode 100644
index 000000000..019b42489
--- /dev/null
+++ b/backend/mirai-console/src/main/kotlin/net/mamoe/mirai/console/setting/internal/_Setting.value.kt
@@ -0,0 +1,31 @@
+/*
+ * Copyright 2020 Mamoe Technologies and contributors.
+ *
+ * 此源代码的使用受 GNU AFFERO GENERAL PUBLIC LICENSE version 3 许可证的约束, 可以在以下链接找到该许可证.
+ * Use of this source code is governed by the GNU AGPLv3 license that can be found through the following link.
+ *
+ * https://github.com/mamoe/mirai/blob/master/LICENSE
+ */
+
+package net.mamoe.mirai.console.setting.internal
+
+import kotlinx.serialization.builtins.serializer
+import net.mamoe.mirai.console.setting.SerializableValue
+import net.mamoe.mirai.console.setting.Setting
+
+
+//// region Setting.value primitives impl CODEGEN ////
+
+// TODO: 2020/6/21 CODEGEN
+
+internal fun Setting.valueImpl(default: Int): SerializableValue<Int> {
+    val instance = object : IntValueImpl(default) {
+        override fun onChanged() = this@valueImpl.onValueChanged(this)
+    }
+    return SerializableValue(instance, Int.serializer().map(
+        serializer = { instance.value },
+        deserializer = { instance.value = it }
+    ))
+}
+
+//// endregion Setting.value primitives impl CODEGEN ////
diff --git a/backend/mirai-console/src/main/kotlin/net/mamoe/mirai/console/setting/internal/collectionUtil.kt b/backend/mirai-console/src/main/kotlin/net/mamoe/mirai/console/setting/internal/collectionUtil.kt
index c686d2fdb..75208385a 100644
--- a/backend/mirai-console/src/main/kotlin/net/mamoe/mirai/console/setting/internal/collectionUtil.kt
+++ b/backend/mirai-console/src/main/kotlin/net/mamoe/mirai/console/setting/internal/collectionUtil.kt
@@ -7,6 +7,8 @@
  * https://github.com/mamoe/mirai/blob/master/LICENSE
  */
 
+@file:Suppress("DuplicatedCode")
+
 package net.mamoe.mirai.console.setting.internal
 
 import kotlinx.serialization.ImplicitReflectionSerializer
@@ -14,7 +16,89 @@ import kotlinx.serialization.serializer
 import net.mamoe.yamlkt.Yaml
 import kotlin.reflect.KClass
 
-internal fun <E, R> MutableList<E>.shadowMap(transform: (E) -> R, transformBack: (R) -> E): MutableList<R> {
+internal inline fun <K, V, KR, VR> MutableMap<K, V>.shadowMap(
+    crossinline kTransform: (K) -> KR,
+    crossinline kTransformBack: (KR) -> K,
+    crossinline vTransform: (V) -> VR,
+    crossinline vTransformBack: (VR) -> V
+): MutableMap<KR, VR> {
+    return object : MutableMap<KR, VR> {
+        override val size: Int get() = this@shadowMap.size
+        override fun containsKey(key: KR): Boolean = this@shadowMap.containsKey(key.let(kTransformBack))
+        override fun containsValue(value: VR): Boolean = this@shadowMap.containsValue(value.let(vTransformBack))
+        override fun get(key: KR): VR? = this@shadowMap[key.let(kTransformBack)]?.let(vTransform)
+        override fun isEmpty(): Boolean = this@shadowMap.isEmpty()
+
+        override val entries: MutableSet<MutableMap.MutableEntry<KR, VR>>
+            get() = this@shadowMap.entries.shadowMap(
+                transform = { entry: MutableMap.MutableEntry<K, V> ->
+                    object : MutableMap.MutableEntry<KR, VR> {
+                        override val key: KR get() = entry.key.let(kTransform)
+                        override val value: VR get() = entry.value.let(vTransform)
+                        override fun setValue(newValue: VR): VR =
+                            entry.setValue(newValue.let(vTransformBack)).let(vTransform)
+                    }
+                } as ((MutableMap.MutableEntry<K, V>) -> MutableMap.MutableEntry<KR, VR>), // type inference bug
+                transformBack = { entry ->
+                    object : MutableMap.MutableEntry<K, V> {
+                        override val key: K get() = entry.key.let(kTransformBack)
+                        override val value: V get() = entry.value.let(vTransformBack)
+                        override fun setValue(newValue: V): V =
+                            entry.setValue(newValue.let(vTransform)).let(vTransformBack)
+                    }
+                }
+            )
+        override val keys: MutableSet<KR>
+            get() = this@shadowMap.keys.shadowMap(kTransform, kTransformBack)
+        override val values: MutableCollection<VR>
+            get() = this@shadowMap.values.shadowMap(vTransform, vTransformBack)
+
+        override fun clear() = this@shadowMap.clear()
+        override fun put(key: KR, value: VR): VR? =
+            this@shadowMap.put(key.let(kTransformBack), value.let(vTransformBack))?.let(vTransform)
+
+        override fun putAll(from: Map<out KR, VR>) {
+            from.forEach { (kr, vr) ->
+                this@shadowMap[kr.let(kTransformBack)] = vr.let(vTransformBack)
+            }
+        }
+
+        override fun remove(key: KR): VR? = this@shadowMap.remove(key.let(kTransformBack))?.let(vTransform)
+    }
+}
+
+internal inline fun <E, R> MutableCollection<E>.shadowMap(
+    crossinline transform: (E) -> R,
+    crossinline transformBack: (R) -> E
+): MutableCollection<R> {
+    return object : MutableCollection<R> {
+        override val size: Int get() = this@shadowMap.size
+
+        override fun contains(element: R): Boolean = this@shadowMap.any { it.let(transform) == element }
+        override fun containsAll(elements: Collection<R>): Boolean = elements.all(::contains)
+        override fun isEmpty(): Boolean = this@shadowMap.isEmpty()
+        override fun iterator(): MutableIterator<R> = object : MutableIterator<R> {
+            private val delegate = this@shadowMap.iterator()
+            override fun hasNext(): Boolean = delegate.hasNext()
+            override fun next(): R = delegate.next().let(transform)
+            override fun remove() = delegate.remove()
+        }
+
+        override fun add(element: R): Boolean = this@shadowMap.add(element.let(transformBack))
+
+        override fun addAll(elements: Collection<R>): Boolean = this@shadowMap.addAll(elements.map(transformBack))
+        override fun clear() = this@shadowMap.clear()
+
+        override fun remove(element: R): Boolean = this@shadowMap.removeIf { it.let(transform) == element }
+        override fun removeAll(elements: Collection<R>): Boolean = elements.all(::remove)
+        override fun retainAll(elements: Collection<R>): Boolean = this@shadowMap.retainAll(elements.map(transformBack))
+    }
+}
+
+internal inline fun <E, R> MutableList<E>.shadowMap(
+    crossinline transform: (E) -> R,
+    crossinline transformBack: (R) -> E
+): MutableList<R> {
     return object : MutableList<R> {
         override val size: Int get() = this@shadowMap.size
 
@@ -78,7 +162,10 @@ internal fun <E, R> MutableList<E>.shadowMap(transform: (E) -> R, transformBack:
 }
 
 
-internal fun <E, R> MutableSet<E>.shadowMap(transform: (E) -> R, transformBack: (R) -> E): MutableSet<R> {
+internal inline fun <E, R> MutableSet<E>.shadowMap(
+    crossinline transform: (E) -> R,
+    crossinline transformBack: (R) -> E
+): MutableSet<R> {
     return object : MutableSet<R> {
         override val size: Int get() = this@shadowMap.size
 
@@ -102,7 +189,7 @@ internal fun <E, R> MutableSet<E>.shadowMap(transform: (E) -> R, transformBack:
     }
 }
 
-internal fun <T> dynamicList(supplier: () -> List<T>): List<T> {
+internal inline fun <T> dynamicList(crossinline supplier: () -> List<T>): List<T> {
     return object : List<T> {
         override val size: Int get() = supplier().size
         override fun contains(element: T): Boolean = supplier().contains(element)
@@ -118,7 +205,7 @@ internal fun <T> dynamicList(supplier: () -> List<T>): List<T> {
     }
 }
 
-internal fun <T> dynamicSet(supplier: () -> Set<T>): Set<T> {
+internal inline fun <T> dynamicSet(crossinline supplier: () -> Set<T>): Set<T> {
     return object : Set<T> {
         override val size: Int get() = supplier().size
         override fun contains(element: T): Boolean = supplier().contains(element)
@@ -129,7 +216,7 @@ internal fun <T> dynamicSet(supplier: () -> Set<T>): Set<T> {
 }
 
 
-internal fun <T> dynamicMutableList(supplier: () -> MutableList<T>): MutableList<T> {
+internal inline fun <T> dynamicMutableList(crossinline supplier: () -> MutableList<T>): MutableList<T> {
     return object : MutableList<T> {
         override val size: Int get() = supplier().size
         override fun contains(element: T): Boolean = supplier().contains(element)
@@ -156,7 +243,7 @@ internal fun <T> dynamicMutableList(supplier: () -> MutableList<T>): MutableList
 }
 
 
-internal fun <T> dynamicMutableSet(supplier: () -> MutableSet<T>): MutableSet<T> {
+internal inline fun <T> dynamicMutableSet(crossinline supplier: () -> MutableSet<T>): MutableSet<T> {
     return object : MutableSet<T> {
         override val size: Int get() = supplier().size
         override fun contains(element: T): Boolean = supplier().contains(element)
@@ -172,6 +259,23 @@ internal fun <T> dynamicMutableSet(supplier: () -> MutableSet<T>): MutableSet<T>
     }
 }
 
+@Suppress("UNCHECKED_CAST", "USELESS_CAST") // type inference bug
+internal inline fun <K, V> MutableMap<K, V>.observable(crossinline onChanged: () -> Unit): MutableMap<K, V> {
+    return object : MutableMap<K, V>, Map<K, V> by (this as Map<K, V>) {
+        override val keys: MutableSet<K>
+            get() = this@observable.keys.observable(onChanged)
+        override val values: MutableCollection<V>
+            get() = this@observable.values.observable(onChanged)
+        override val entries: MutableSet<MutableMap.MutableEntry<K, V>>
+            get() = this@observable.entries.observable(onChanged)
+
+        override fun clear() = this@observable.clear().also { onChanged() }
+        override fun put(key: K, value: V): V? = this@observable.put(key, value).also { onChanged() }
+        override fun putAll(from: Map<out K, V>) = this@observable.putAll(from).also { onChanged() }
+        override fun remove(key: K): V? = this@observable.remove(key).also { onChanged() }
+    }
+}
+
 internal inline fun <T> MutableList<T>.observable(crossinline onChanged: () -> Unit): MutableList<T> {
     return object : MutableList<T> {
         override val size: Int get() = this@observable.size
@@ -234,6 +338,31 @@ internal inline fun <T> MutableList<T>.observable(crossinline onChanged: () -> U
     }
 }
 
+internal inline fun <T> MutableCollection<T>.observable(crossinline onChanged: () -> Unit): MutableCollection<T> {
+    return object : MutableCollection<T> {
+        override val size: Int get() = this@observable.size
+        override fun contains(element: T): Boolean = this@observable.contains(element)
+        override fun containsAll(elements: Collection<T>): Boolean = this@observable.containsAll(elements)
+        override fun isEmpty(): Boolean = this@observable.isEmpty()
+        override fun iterator(): MutableIterator<T> = object : MutableIterator<T> {
+            private val delegate = this@observable.iterator()
+            override fun hasNext(): Boolean = delegate.hasNext()
+            override fun next(): T = delegate.next()
+            override fun remove() = delegate.remove().also { onChanged() }
+        }
+
+        override fun add(element: T): Boolean = this@observable.add(element).also { onChanged() }
+        override fun addAll(elements: Collection<T>): Boolean = this@observable.addAll(elements).also { onChanged() }
+        override fun clear() = this@observable.clear().also { onChanged() }
+        override fun remove(element: T): Boolean = this@observable.remove(element).also { onChanged() }
+        override fun removeAll(elements: Collection<T>): Boolean =
+            this@observable.removeAll(elements).also { onChanged() }
+
+        override fun retainAll(elements: Collection<T>): Boolean =
+            this@observable.retainAll(elements).also { onChanged() }
+    }
+}
+
 internal inline fun <T> MutableSet<T>.observable(crossinline onChanged: () -> Unit): MutableSet<T> {
     return object : MutableSet<T> {
         override val size: Int get() = this@observable.size
diff --git a/backend/mirai-console/src/main/kotlin/net/mamoe/mirai/console/setting/internal/internal.kt b/backend/mirai-console/src/main/kotlin/net/mamoe/mirai/console/setting/internal/serializerUtil.kt
similarity index 86%
rename from backend/mirai-console/src/main/kotlin/net/mamoe/mirai/console/setting/internal/internal.kt
rename to backend/mirai-console/src/main/kotlin/net/mamoe/mirai/console/setting/internal/serializerUtil.kt
index b054b31b8..454544929 100644
--- a/backend/mirai-console/src/main/kotlin/net/mamoe/mirai/console/setting/internal/internal.kt
+++ b/backend/mirai-console/src/main/kotlin/net/mamoe/mirai/console/setting/internal/serializerUtil.kt
@@ -10,16 +10,9 @@
 package net.mamoe.mirai.console.setting.internal
 
 import kotlinx.serialization.*
-import kotlinx.serialization.builtins.ListSerializer
-import kotlinx.serialization.builtins.serializer
-import net.mamoe.mirai.utils.MiraiExperimentalAPI
-import net.mamoe.yamlkt.Yaml
-import net.mamoe.yamlkt.YamlConfiguration
 import kotlin.reflect.KProperty
 import kotlin.reflect.full.findAnnotation
 
-internal object SettingSerializerMark
-
 internal val KProperty<*>.serialNameOrPropertyName: String get() = this.findAnnotation<SerialName>()?.value ?: this.name
 
 internal inline fun <E> KSerializer<E>.bind(
diff --git a/backend/mirai-console/src/test/kotlin/net/mamoe/mirai/console/command/TestComposite.kt b/backend/mirai-console/src/test/kotlin/net/mamoe/mirai/console/command/TestComposite.kt
index c1cfe009f..133eb62db 100644
--- a/backend/mirai-console/src/test/kotlin/net/mamoe/mirai/console/command/TestComposite.kt
+++ b/backend/mirai-console/src/test/kotlin/net/mamoe/mirai/console/command/TestComposite.kt
@@ -18,8 +18,9 @@ object TestCompositeCommand : CompositeCommand(
     "groupManagement", "grpMgn"
 ) {
     @SubCommand
-    suspend fun CommandSender.mute(image: Image, target: Member, seconds: Int) {
+    suspend fun CommandSender.mute(image: Image, target: Member, seconds: Int): Boolean {
         target.mute(seconds)
+        return true
     }
 }
 
diff --git a/backend/mirai-console/src/test/kotlin/net/mamoe/mirai/console/setting/SettingTest.kt b/backend/mirai-console/src/test/kotlin/net/mamoe/mirai/console/setting/SettingTest.kt
new file mode 100644
index 000000000..011486cc5
--- /dev/null
+++ b/backend/mirai-console/src/test/kotlin/net/mamoe/mirai/console/setting/SettingTest.kt
@@ -0,0 +1,26 @@
+/*
+ * Copyright 2020 Mamoe Technologies and contributors.
+ *
+ * 此源代码的使用受 GNU AFFERO GENERAL PUBLIC LICENSE version 3 许可证的约束, 可以在以下链接找到该许可证.
+ * Use of this source code is governed by the GNU AGPLv3 license that can be found through the following link.
+ *
+ * https://github.com/mamoe/mirai/blob/master/LICENSE
+ */
+
+package net.mamoe.mirai.console.setting
+
+import org.junit.jupiter.api.Test
+
+internal class SettingTest {
+
+    class MySetting : Setting() {
+        val int by value(1)
+        val map by valueReified(mapOf("" to ""))
+        val map2 by valueReified(mapOf("" to mapOf("" to mapOf("" to ""))))
+    }
+
+    @Test
+    fun testPrimitive() {
+
+    }
+}
\ No newline at end of file
diff --git a/build.gradle.kts b/build.gradle.kts
index ad1429f2e..e747edcae 100644
--- a/build.gradle.kts
+++ b/build.gradle.kts
@@ -1,33 +1,15 @@
 @file:Suppress("UnstableApiUsage")
 
-import kotlin.math.pow
-
 tasks.withType(JavaCompile::class.java) {
     options.encoding = "UTF8"
 }
 
-buildscript {
-    repositories {
-        maven(url = "https://dl.bintray.com/kotlin/kotlin-eap")
-        maven(url = "https://mirrors.huaweicloud.com/repository/maven")
-        jcenter()
-        mavenCentral()
-    }
-
-    dependencies {
-        classpath("com.github.jengelman.gradle.plugins:shadow:5.2.0")
-        classpath("org.jetbrains.kotlin:kotlin-serialization:${Versions.Kotlin.stdlib}")
-        classpath("org.jetbrains.kotlin:kotlin-gradle-plugin:${Versions.Kotlin.stdlib}")
-        classpath("com.jfrog.bintray.gradle:gradle-bintray-plugin:1.8.4") // don"t use any other.
-    }
-}
-
 allprojects {
     group = "net.mamoe"
 
     repositories {
+        mavenLocal()
         maven(url = "https://dl.bintray.com/kotlin/kotlin-eap")
-        maven(url = "https://mirrors.huaweicloud.com/repository/maven")
         jcenter()
         mavenCentral()
     }
@@ -35,97 +17,8 @@ allprojects {
 
 subprojects {
     afterEvaluate {
-        apply(plugin = "com.github.johnrengelman.shadow")
-        val kotlin =
-            (this as ExtensionAware).extensions.getByName("kotlin") as? org.jetbrains.kotlin.gradle.dsl.KotlinJvmProjectExtension
-                ?: return@afterEvaluate
+        apply<MiraiConsoleBuildPlugin>()
 
-        tasks.getByName("shadowJar") {
-            doLast {
-                this.outputs.files.forEach {
-                    if (it.nameWithoutExtension.endsWith("-all")) {
-                        val output = File(
-                            it.path.substringBeforeLast(File.separator) + File.separator + it.nameWithoutExtension.substringBeforeLast(
-                                "-all"
-                            ) + "." + it.extension
-                        )
-
-                        println("Renaming to ${output.path}")
-                        if (output.exists()) {
-                            output.delete()
-                        }
-
-                        it.renameTo(output)
-                    }
-                }
-            }
-        }
-
-        val githubUpload by tasks.creating {
-            group = "mirai"
-            dependsOn(tasks.getByName("shadowJar"))
-
-            doFirst {
-                timeout.set(java.time.Duration.ofHours(3))
-                findLatestFile()?.let { (_, file) ->
-                    val filename = file.name
-                    println("Uploading file $filename")
-                    runCatching {
-                        upload.GitHub.upload(
-                            file,
-                            "https://api.github.com/repos/mamoe/mirai-repo/contents/shadow/${project.name}/$filename",
-                            project
-                        )
-                    }.exceptionOrNull()?.let {
-                        System.err.println("GitHub Upload failed")
-                        it.printStackTrace() // force show stacktrace
-                        throw it
-                    }
-                }
-            }
-        }
-
-        val cuiCloudUpload by tasks.creating {
-            group = "mirai"
-            dependsOn(tasks.getByName("shadowJar"))
-
-            doFirst {
-                timeout.set(java.time.Duration.ofHours(3))
-                findLatestFile()?.let { (_, file) ->
-                    val filename = file.name
-                    println("Uploading file $filename")
-                    runCatching {
-                        upload.CuiCloud.upload(
-                            file,
-                            project
-                        )
-                    }.exceptionOrNull()?.let {
-                        System.err.println("CuiCloud Upload failed")
-                        it.printStackTrace() // force show stacktrace
-                        throw it
-                    }
-                }
-            }
-
-        }
+        setJavaCompileTarget()
     }
-}
-
-
-fun Project.findLatestFile(): Map.Entry<String, File> {
-    return File(projectDir, "build/libs").walk()
-        .filter { it.isFile }
-        .onEach { println("all files=$it") }
-        .filter { it.name.matches(Regex("""${project.name}-[0-9][0-9]*(\.[0-9]*)*.*\.jar""")) }
-        .onEach { println("matched file: ${it.name}") }
-        .associateBy { it.nameWithoutExtension.substringAfterLast('-') }
-        .onEach { println("versions: $it") }
-        .maxBy { (version, file) ->
-            version.split('.').let {
-                if (it.size == 2) it + "0"
-                else it
-            }.reversed().foldIndexed(0) { index: Int, acc: Int, s: String ->
-                acc + 100.0.pow(index).toInt() * (s.toIntOrNull() ?: 0)
-            }
-        } ?: error("cannot find any file to upload")
-}
+}
\ No newline at end of file
diff --git a/buildSrc/build.gradle.kts b/buildSrc/build.gradle.kts
index a0b4b2f9b..0473f2f16 100644
--- a/buildSrc/build.gradle.kts
+++ b/buildSrc/build.gradle.kts
@@ -3,7 +3,10 @@ plugins {
 }
 
 repositories {
+    mavenLocal()
     jcenter()
+    maven(url = "https://dl.bintray.com/kotlin/kotlin-eap")
+    mavenCentral()
 }
 
 kotlin {
@@ -24,4 +27,11 @@ dependencies {
     api(ktor("client-core", "1.3.2"))
     api(ktor("client-cio", "1.3.2"))
     api(ktor("client-json", "1.3.2"))
+
+    //api(gradleApi())
+    //compileOnly("org.jetbrains.kotlin:kotlin-gradle-plugin:1.3.72")
+    compileOnly("org.jetbrains.kotlin:kotlin-gradle-plugin:1.3.72")
+    //runtimeOnly("org.jetbrains.kotlin:kotlin-gradle-plugin:1.3.72")
+
+    api("com.github.jengelman.gradle.plugins:shadow:6.0.0")
 }
\ No newline at end of file
diff --git a/buildSrc/src/main/kotlin/MiraiConsoleBuildPlugin.kt b/buildSrc/src/main/kotlin/MiraiConsoleBuildPlugin.kt
new file mode 100644
index 000000000..2df6c68ab
--- /dev/null
+++ b/buildSrc/src/main/kotlin/MiraiConsoleBuildPlugin.kt
@@ -0,0 +1,115 @@
+/*
+ * Copyright 2020 Mamoe Technologies and contributors.
+ *
+ * 此源代码的使用受 GNU AFFERO GENERAL PUBLIC LICENSE version 3 许可证的约束, 可以在以下链接找到该许可证.
+ * Use of this source code is governed by the GNU AGPLv3 license that can be found through the following link.
+ *
+ * https://github.com/mamoe/mirai/blob/master/LICENSE
+ */
+
+@file:Suppress("UnstableApiUsage")
+
+import com.github.jengelman.gradle.plugins.shadow.ShadowPlugin
+import org.gradle.api.Plugin
+import org.gradle.api.Project
+import org.gradle.kotlin.dsl.apply
+import org.gradle.kotlin.dsl.creating
+import java.io.File
+import kotlin.math.pow
+
+class MiraiConsoleBuildPlugin : Plugin<Project> {
+    override fun apply(target: Project) = target.run {
+        apply<ShadowPlugin>()
+
+        if (tasks.none { it.name == "shadowJar" }) {
+            return@run
+        }
+
+        tasks.getByName("shadowJar") {
+            doLast {
+                this.outputs.files.forEach {
+                    if (it.nameWithoutExtension.endsWith("-all")) {
+                        val output = File(
+                            it.path.substringBeforeLast(File.separator) + File.separator + it.nameWithoutExtension.substringBeforeLast(
+                                "-all"
+                            ) + "." + it.extension
+                        )
+
+                        println("Renaming to ${output.path}")
+                        if (output.exists()) {
+                            output.delete()
+                        }
+
+                        it.renameTo(output)
+                    }
+                }
+            }
+        }
+
+        tasks.creating {
+            group = "mirai"
+            dependsOn(tasks.getByName("shadowJar"))
+
+            doFirst {
+                timeout.set(java.time.Duration.ofHours(3))
+                findLatestFile().let { (_, file) ->
+                    val filename = file.name
+                    println("Uploading file $filename")
+                    runCatching {
+                        upload.GitHub.upload(
+                            file,
+                            "https://api.github.com/repos/mamoe/mirai-repo/contents/shadow/${project.name}/$filename",
+                            project
+                        )
+                    }.exceptionOrNull()?.let {
+                        System.err.println("GitHub Upload failed")
+                        it.printStackTrace() // force show stacktrace
+                        throw it
+                    }
+                }
+            }
+        }
+
+        tasks.creating {
+            group = "mirai"
+            dependsOn(tasks.getByName("shadowJar"))
+
+            doFirst {
+                timeout.set(java.time.Duration.ofHours(3))
+                findLatestFile().let { (_, file) ->
+                    val filename = file.name
+                    println("Uploading file $filename")
+                    runCatching {
+                        upload.CuiCloud.upload(
+                            file,
+                            project
+                        )
+                    }.exceptionOrNull()?.let {
+                        System.err.println("CuiCloud Upload failed")
+                        it.printStackTrace() // force show stacktrace
+                        throw it
+                    }
+                }
+            }
+
+        }
+    }
+}
+
+fun Project.findLatestFile(): Map.Entry<String, File> {
+    return File(projectDir, "build/libs").walk()
+        .filter { it.isFile }
+        .onEach { println("all files=$it") }
+        .filter { it.name.matches(Regex("""${project.name}-[0-9][0-9]*(\.[0-9]*)*.*\.jar""")) }
+        .onEach { println("matched file: ${it.name}") }
+        .associateBy { it.nameWithoutExtension.substringAfterLast('-') }
+        .onEach { println("versions: $it") }
+        .maxBy { (version, _) ->
+            version.split('.').let {
+                if (it.size == 2) it + "0"
+                else it
+            }.reversed().foldIndexed(0) { index: Int, acc: Int, s: String ->
+                acc + 100.0.pow(index).toInt() * (s.toIntOrNull() ?: 0)
+            }
+        } ?: error("cannot find any file to upload")
+}
diff --git a/buildSrc/src/main/kotlin/SetCompileTargetPlugin.kt b/buildSrc/src/main/kotlin/SetCompileTargetPlugin.kt
new file mode 100644
index 000000000..8910359a3
--- /dev/null
+++ b/buildSrc/src/main/kotlin/SetCompileTargetPlugin.kt
@@ -0,0 +1,45 @@
+/*
+ * Copyright 2020 Mamoe Technologies and contributors.
+ *
+ * 此源代码的使用受 GNU AFFERO GENERAL PUBLIC LICENSE version 3 许可证的约束, 可以在以下链接找到该许可证.
+ * Use of this source code is governed by the GNU AGPLv3 license that can be found through the following link.
+ *
+ * https://github.com/mamoe/mirai/blob/master/LICENSE
+ */
+
+import org.gradle.api.JavaVersion
+import org.gradle.api.Project
+import org.gradle.api.plugins.JavaPluginExtension
+import org.gradle.api.tasks.compile.JavaCompile
+import java.lang.reflect.Method
+import kotlin.reflect.KClass
+
+
+fun Any.reflectMethod(name: String, vararg params: KClass<out Any>): Pair<Any, Method> {
+    return this to this::class.java.getMethod(name, *params.map { it.java }.toTypedArray())
+}
+
+operator fun Pair<Any, Method>.invoke(vararg args: Any?): Any? {
+    return second.invoke(first, *args)
+}
+
+@Suppress("NOTHING_TO_INLINE") // or error
+fun Project.setJavaCompileTarget() {
+    tasks.filter { it.name in arrayOf("compileKotlin", "compileTestKotlin") }.forEach { task ->
+        task
+            .reflectMethod("getKotlinOptions")()!!
+            .reflectMethod("setJvmTarget", String::class)("1.8")
+    }
+
+
+    kotlin.runCatching { // apply only when java plugin is available
+        (extensions.getByName("java") as JavaPluginExtension).run {
+            sourceCompatibility = JavaVersion.VERSION_1_8
+            targetCompatibility = JavaVersion.VERSION_1_8
+        }
+
+        tasks.withType(JavaCompile::class.java) {
+            options.encoding = "UTF8"
+        }
+    }
+}
\ No newline at end of file
diff --git a/buildSrc/src/main/kotlin/Versions.kt b/buildSrc/src/main/kotlin/Versions.kt
index 6647de79e..050457830 100644
--- a/buildSrc/src/main/kotlin/Versions.kt
+++ b/buildSrc/src/main/kotlin/Versions.kt
@@ -8,18 +8,18 @@
  */
 
 object Versions {
-    object Mirai {
-        const val core = "1.0.0"
-        const val console = "0.5.1"
-        const val consoleGraphical = "0.0.7"
-        const val consoleTerminal = "0.1.0"
-        const val consolePure = "0.1.0"
-    }
+    const val core = "1.1-EA"
+    const val console = "0.5.1"
+    const val consoleGraphical = "0.0.7"
+    const val consoleTerminal = "0.1.0"
+    const val consolePure = "0.1.0"
 
-    object Kotlin {
-        const val stdlib = "1.3.72"
-        const val coroutines = "1.3.7"
-        const val serialization = "0.20.0"
-        const val ktor = "1.3.2"
-    }
+    const val kotlin = "1.3.72"
+    const val coroutines = "1.3.7"
+    const val serialization = "0.20.0"
+    const val ktor = "1.3.2"
+
+    const val androidGradle = "3.6.2"
+
+    const val bintray = "1.8.4"
 }
\ No newline at end of file
diff --git a/buildSrc/src/main/kotlin/dependencyExtensions.kt b/buildSrc/src/main/kotlin/dependencyExtensions.kt
index 03bee26e5..5a9f08d92 100644
--- a/buildSrc/src/main/kotlin/dependencyExtensions.kt
+++ b/buildSrc/src/main/kotlin/dependencyExtensions.kt
@@ -5,7 +5,7 @@ import org.gradle.kotlin.dsl.DependencyHandlerScope
 fun DependencyHandlerScope.kotlinx(id: String, version: String) = "org.jetbrains.kotlinx:kotlinx-$id:$version"
 
 @Suppress("unused")
-fun DependencyHandlerScope.ktor(id: String, version: String = Versions.Kotlin.ktor) = "io.ktor:ktor-$id:$version"
+fun DependencyHandlerScope.ktor(id: String, version: String = Versions.ktor) = "io.ktor:ktor-$id:$version"
 
 @Suppress("unused")
 fun DependencyHandler.compileAndRuntime(any: Any) {
diff --git a/frontend/mirai-console-graphical/build.gradle.kts b/frontend/mirai-console-graphical/build.gradle.kts
index c9e6de907..12bbba3b6 100644
--- a/frontend/mirai-console-graphical/build.gradle.kts
+++ b/frontend/mirai-console-graphical/build.gradle.kts
@@ -29,17 +29,17 @@ version = Versions.Mirai.consoleGraphical
 description = "Graphical frontend for mirai-console"
 
 dependencies {
-    compileOnly("net.mamoe:mirai-core:${Versions.Mirai.core}")
+    compileOnly("net.mamoe:mirai-core:${Versions.core}")
     implementation(project(":mirai-console"))
 
     api(group = "no.tornado", name = "tornadofx", version = "1.7.19")
     api(group = "com.jfoenix", name = "jfoenix", version = "9.0.8")
 
     testApi(project(":mirai-console"))
-    testApi(kotlinx("coroutines-core", Versions.Kotlin.coroutines))
+    testApi(kotlinx("coroutines-core", Versions.coroutines))
     testApi(group = "org.yaml", name = "snakeyaml", version = "1.25")
-    testApi("net.mamoe:mirai-core:${Versions.Mirai.core}")
-    testApi("net.mamoe:mirai-core-qqandroid:${Versions.Mirai.core}")
+    testApi("net.mamoe:mirai-core:${Versions.core}")
+    testApi("net.mamoe:mirai-core-qqandroid:${Versions.core}")
 }
 
 kotlin {
@@ -47,7 +47,7 @@ kotlin {
         all {
 
             languageSettings.useExperimentalAnnotation("kotlin.Experimental")
-            languageSettings.useExperimentalAnnotation("kotlin.OptIn")
+            languageSettings.useExperimentalAnnotation("kotlin.RequiresOptIn")
             languageSettings.progressiveMode = true
             languageSettings.useExperimentalAnnotation("net.mamoe.mirai.utils.MiraiInternalAPI")
         }
diff --git a/frontend/mirai-console-pure/build.gradle.kts b/frontend/mirai-console-pure/build.gradle.kts
index c0ce1e6a7..ea7d4c798 100644
--- a/frontend/mirai-console-pure/build.gradle.kts
+++ b/frontend/mirai-console-pure/build.gradle.kts
@@ -1,22 +1,18 @@
-import org.jetbrains.kotlin.gradle.tasks.KotlinCompile
-
 plugins {
-    kotlin("jvm")
-    kotlin("plugin.serialization")
+    kotlin("jvm") version Versions.kotlin
+    kotlin("plugin.serialization") version Versions.kotlin
     id("java")
     `maven-publish`
-    id("com.jfrog.bintray")
+    id("com.jfrog.bintray") version Versions.bintray
 }
 
-apply(plugin = "com.github.johnrengelman.shadow")
-
 kotlin {
     sourceSets {
         all {
             languageSettings.enableLanguageFeature("InlineClasses")
 
             languageSettings.useExperimentalAnnotation("kotlin.Experimental")
-            languageSettings.useExperimentalAnnotation("kotlin.OptIn")
+            languageSettings.useExperimentalAnnotation("kotlin.RequiresOptIn")
             languageSettings.progressiveMode = true
             languageSettings.useExperimentalAnnotation("net.mamoe.mirai.utils.MiraiInternalAPI")
             languageSettings.useExperimentalAnnotation("kotlin.ExperimentalUnsignedTypes")
@@ -25,31 +21,19 @@ kotlin {
         }
     }
 }
-dependencies {
-    compileOnly(project(":mirai-console"))
-    compileOnly("net.mamoe:mirai-core:${Versions.Mirai.core}")
-    compileOnly(kotlin("stdlib")) // embedded by core
 
-    testApi("net.mamoe:mirai-core-qqandroid:${Versions.Mirai.core}")
+dependencies {
+    implementation("org.jline:jline:3.15.0")
+    implementation("org.fusesource.jansi:jansi:1.18")
+
+    compileAndRuntime(project(":mirai-console"))
+    compileAndRuntime("net.mamoe:mirai-core:${Versions.core}")
+    compileAndRuntime(kotlin("stdlib")) // embedded by core
+
+    testApi("net.mamoe:mirai-core-qqandroid:${Versions.core}")
     testApi(project(":mirai-console"))
 }
 
-version = Versions.Mirai.consolePure
+version = Versions.consolePure
 
-description = "Console Pure CLI frontend for mirai"
-
-val compileKotlin: KotlinCompile by tasks
-compileKotlin.kotlinOptions {
-    jvmTarget = "1.8"
-}
-val compileTestKotlin: KotlinCompile by tasks
-compileTestKotlin.kotlinOptions {
-    jvmTarget = "1.8"
-}
-java {
-    sourceCompatibility = JavaVersion.VERSION_1_8
-    targetCompatibility = JavaVersion.VERSION_1_8
-}
-tasks.withType(JavaCompile::class.java) {
-    options.encoding = "UTF8"
-}
\ No newline at end of file
+description = "Console Pure CLI frontend for mirai"
\ No newline at end of file
diff --git a/frontend/mirai-console-pure/src/main/kotlin/net/mamoe/mirai/console/pure/ConsoleUtils.kt b/frontend/mirai-console-pure/src/main/kotlin/net/mamoe/mirai/console/pure/ConsoleUtils.kt
new file mode 100644
index 000000000..a363e5e03
--- /dev/null
+++ b/frontend/mirai-console-pure/src/main/kotlin/net/mamoe/mirai/console/pure/ConsoleUtils.kt
@@ -0,0 +1,37 @@
+/*
+ * Copyright 2020 Mamoe Technologies and contributors.
+ *
+ * 此源代码的使用受 GNU AFFERO GENERAL PUBLIC LICENSE version 3 许可证的约束, 可以在以下链接找到该许可证.
+ * Use of this source code is governed by the GNU AGPLv3 license that can be found through the following link.
+ *
+ * https://github.com/mamoe/mirai/blob/master/LICENSE
+ *
+ */
+
+package net.mamoe.mirai.console.pure
+
+import org.jline.reader.LineReader
+import org.jline.reader.LineReaderBuilder
+import org.jline.reader.impl.completer.NullCompleter
+import org.jline.terminal.Terminal
+import org.jline.terminal.TerminalBuilder
+
+object ConsoleUtils {
+
+    val lineReader: LineReader
+    val terminal: Terminal
+
+    init {
+
+        val dumb = System.getProperty("java.class.path")
+            .contains("idea_rt.jar") || System.getProperty("mirai.idea") !== null
+
+        terminal = TerminalBuilder.builder()
+            .dumb(dumb)
+            .build()
+        lineReader = LineReaderBuilder.builder()
+            .terminal(terminal)
+            .completer(NullCompleter())
+            .build()
+    }
+}
\ No newline at end of file
diff --git a/frontend/mirai-console-pure/src/main/kotlin/net/mamoe/mirai/console/pure/MiraiConsoleFrontEndPure.kt b/frontend/mirai-console-pure/src/main/kotlin/net/mamoe/mirai/console/pure/MiraiConsoleFrontEndPure.kt
index e000b7a7d..e8dc2ef2e 100644
--- a/frontend/mirai-console-pure/src/main/kotlin/net/mamoe/mirai/console/pure/MiraiConsoleFrontEndPure.kt
+++ b/frontend/mirai-console-pure/src/main/kotlin/net/mamoe/mirai/console/pure/MiraiConsoleFrontEndPure.kt
@@ -9,20 +9,90 @@
 
 package net.mamoe.mirai.console.pure
 
-import kotlinx.coroutines.delay
+//import net.mamoe.mirai.console.command.CommandManager
+//import net.mamoe.mirai.console.utils.MiraiConsoleFrontEnd
 import net.mamoe.mirai.Bot
-import net.mamoe.mirai.console.command.CommandManager
-import net.mamoe.mirai.console.command.ConsoleCommandSender
-import net.mamoe.mirai.console.utils.MiraiConsoleFrontEnd
-import net.mamoe.mirai.utils.DefaultLogger
+import net.mamoe.mirai.console.MiraiConsoleFrontEnd
 import net.mamoe.mirai.utils.DefaultLoginSolver
 import net.mamoe.mirai.utils.LoginSolver
 import net.mamoe.mirai.utils.MiraiLogger
+import net.mamoe.mirai.utils.PlatformLogger
+import org.fusesource.jansi.Ansi
 import java.text.SimpleDateFormat
 import java.util.*
-import kotlin.concurrent.thread
+import java.util.concurrent.ConcurrentHashMap
+
+private val ANSI_RESET = Ansi().reset().toString()
+
+internal val LoggerCreator: (identity: String?) -> MiraiLogger = {
+    PlatformLogger(identity = it, output = { line ->
+        ConsoleUtils.lineReader.printAbove(line + ANSI_RESET)
+    })
+}
+
+@Suppress("unused")
+object MiraiConsoleFrontEndPure : MiraiConsoleFrontEnd {
+    private val globalLogger = LoggerCreator("Mirai")
+    private val cachedLoggers = ConcurrentHashMap<String, MiraiLogger>()
+
+    // companion object {
+    // ANSI color codes
+    const val COLOR_RED = "\u001b[38;5;196m"
+    const val COLOR_CYAN = "\u001b[38;5;87m"
+    const val COLOR_GREEN = "\u001b[38;5;82m"
+
+    // use a dark yellow(more like orange) instead of light one to save Solarized-light users
+    const val COLOR_YELLOW = "\u001b[38;5;220m"
+    const val COLOR_GREY = "\u001b[38;5;244m"
+    const val COLOR_BLUE = "\u001b[38;5;27m"
+    const val COLOR_NAVY = "\u001b[38;5;24m" // navy uniform blue
+    const val COLOR_PINK = "\u001b[38;5;207m"
+    const val COLOR_RESET = "\u001b[39;49m"
+    // }
+
+    val sdf by lazy {
+        SimpleDateFormat("HH:mm:ss")
+    }
 
 
+    override fun loggerFor(identity: String?): MiraiLogger {
+        identity?.apply {
+            return cachedLoggers.computeIfAbsent(this, LoggerCreator)
+        }
+        return globalLogger
+    }
+
+    override fun prePushBot(identity: Long) {
+    }
+
+    override fun pushBot(bot: Bot) {
+    }
+
+    override suspend fun requestInput(hint: String): String {
+        if (hint.isNotEmpty()) {
+            ConsoleUtils.lineReader.printAbove(
+                Ansi.ansi()
+                    .fgCyan().a(sdf.format(Date()))
+                    .fgMagenta().a(hint)
+                    .toString()
+            )
+        }
+        return ConsoleUtils.lineReader.readLine("> ")
+    }
+
+    override fun pushBotAdminStatus(identity: Long, admins: List<Long>) {
+    }
+
+    override fun createLoginSolver(): LoginSolver {
+        return DefaultLoginSolver(
+            input = suspend {
+                requestInput("")
+            }
+        )
+    }
+}
+
+/*
 class MiraiConsoleFrontEndPure : MiraiConsoleFrontEnd {
     private var requesting = false
     private var requestStr = ""
@@ -106,4 +176,4 @@ class MiraiConsoleFrontEndPure : MiraiConsoleFrontEnd {
 
 }
 
-
+*/
diff --git a/frontend/mirai-console-pure/src/main/kotlin/net/mamoe/mirai/console/pure/MiraiConsolePure.kt b/frontend/mirai-console-pure/src/main/kotlin/net/mamoe/mirai/console/pure/MiraiConsolePure.kt
new file mode 100644
index 000000000..0cb890027
--- /dev/null
+++ b/frontend/mirai-console-pure/src/main/kotlin/net/mamoe/mirai/console/pure/MiraiConsolePure.kt
@@ -0,0 +1,46 @@
+/*
+ * Copyright 2020 Mamoe Technologies and contributors.
+ *
+ * 此源代码的使用受 GNU AFFERO GENERAL PUBLIC LICENSE version 3 许可证的约束, 可以在以下链接找到该许可证.
+ * Use of this source code is governed by the GNU AGPLv3 license that can be found through the following link.
+ *
+ * https://github.com/mamoe/mirai/blob/master/LICENSE
+ *
+ */
+
+@file:Suppress(
+    "INVISIBLE_MEMBER",
+    "INVISIBLE_REFERENCE",
+    "CANNOT_OVERRIDE_INVISIBLE_MEMBER",
+    "INVISIBLE_SETTER",
+    "INVISIBLE_GETTER",
+    "INVISIBLE_ABSTRACT_MEMBER_FROM_SUPER",
+    "INVISIBLE_ABSTRACT_MEMBER_FROM_SUPE_WARNING"
+)
+
+package net.mamoe.mirai.console.pure
+
+
+import kotlinx.coroutines.CoroutineScope
+import net.mamoe.mirai.console.IMiraiConsole
+import net.mamoe.mirai.console.MiraiConsoleFrontEnd
+import net.mamoe.mirai.console.plugin.PluginLoader
+import net.mamoe.mirai.utils.DefaultLogger
+import net.mamoe.mirai.utils.MiraiLogger
+import java.io.File
+import java.util.*
+import kotlin.coroutines.CoroutineContext
+import kotlin.coroutines.EmptyCoroutineContext
+
+private val delegateScope = CoroutineScope(EmptyCoroutineContext)
+
+object MiraiConsolePure : IMiraiConsole {
+    override val builtInPluginLoaders: List<PluginLoader<*, *>> = LinkedList()
+    override val frontEnd: MiraiConsoleFrontEnd = MiraiConsoleFrontEndPure
+    override val mainLogger: MiraiLogger = DefaultLogger("Console")
+    override val rootDir: File = File("./test/console").also {
+        it.mkdirs()
+    }
+    override val coroutineContext: CoroutineContext
+        get() = delegateScope.coroutineContext
+}
\ No newline at end of file
diff --git a/frontend/mirai-console-pure/src/main/kotlin/net/mamoe/mirai/console/pure/MiraiConsolePureLoader.kt b/frontend/mirai-console-pure/src/main/kotlin/net/mamoe/mirai/console/pure/MiraiConsolePureLoader.kt
index d5a144a5c..ad142caa5 100644
--- a/frontend/mirai-console-pure/src/main/kotlin/net/mamoe/mirai/console/pure/MiraiConsolePureLoader.kt
+++ b/frontend/mirai-console-pure/src/main/kotlin/net/mamoe/mirai/console/pure/MiraiConsolePureLoader.kt
@@ -7,68 +7,67 @@
  * https://github.com/mamoe/mirai/blob/master/LICENSE
  */
 
+@file:Suppress(
+    "INVISIBLE_MEMBER",
+    "INVISIBLE_REFERENCE",
+    "CANNOT_OVERRIDE_INVISIBLE_MEMBER",
+    "INVISIBLE_SETTER",
+    "INVISIBLE_GETTER",
+    "INVISIBLE_ABSTRACT_MEMBER_FROM_SUPER",
+    "INVISIBLE_ABSTRACT_MEMBER_FROM_SUPE_WARNING"
+)
+
 package net.mamoe.mirai.console.pure
 
-import net.mamoe.mirai.console.MiraiConsole
-import net.mamoe.mirai.console.command.CommandManager
-import net.mamoe.mirai.console.command.DefaultCommands
-import net.mamoe.mirai.console.plugins.PluginManager
-import net.mamoe.mirai.console.utils.MiraiConsoleFrontEnd
+import net.mamoe.mirai.console.MiraiConsoleInitializer
+import net.mamoe.mirai.console.command.CommandExecuteStatus
+import net.mamoe.mirai.console.command.ConsoleCommandSender
+import net.mamoe.mirai.console.command.executeCommand
+import net.mamoe.mirai.message.data.Message
+import net.mamoe.mirai.message.data.PlainText
+import net.mamoe.mirai.utils.DefaultLogger
 import kotlin.concurrent.thread
 
-class MiraiConsolePureLoader {
-    companion object {
-        @JvmStatic
-        fun load(
-            coreVersion: String,
-            consoleVersion: String
-        ) {
-            start(
-                MiraiConsoleFrontEndPure(),
-                coreVersion,
-                consoleVersion
-            )
-            Runtime.getRuntime().addShutdownHook(thread(start = false) {
-                MiraiConsole.stop()
-            })
+object MiraiConsolePureLoader {
+    @JvmStatic
+    fun main(args: Array<String>?) {
+        startup()
+    }
+}
+
+
+internal fun startup() {
+    MiraiConsoleInitializer.init(MiraiConsolePure)
+    startConsoleThread()
+}
+
+internal fun startConsoleThread() {
+    thread(name = "Console", isDaemon = false) {
+        val consoleLogger = DefaultLogger("Console")
+        kotlinx.coroutines.runBlocking {
+            while (true) {
+                val next = MiraiConsoleFrontEndPure.requestInput("")
+                consoleLogger.debug("INPUT> $next")
+                val result = ConsoleCS.executeCommand(PlainText(next))
+                when (result.status) {
+                    CommandExecuteStatus.SUCCESSFUL -> {
+                    }
+                    CommandExecuteStatus.EMPTY_COMMAND -> {
+                    }
+                    CommandExecuteStatus.FAILED -> {
+                        consoleLogger.error("An error occurred while executing the command: $next", result.exception)
+                    }
+                    CommandExecuteStatus.COMMAND_NOT_FOUND -> {
+                        consoleLogger.warning("Unknown command: ${result.commandName}")
+                    }
+                }
+            }
         }
     }
 }
 
-/**
- * 启动 Console
- */
-@JvmOverloads
-internal fun start(
-    frontEnd: MiraiConsoleFrontEnd,
-    coreVersion: String = "0.0.0",
-    consoleVersion: String = "0.0.0",
-    path: String = System.getProperty("user.dir")
-) {
-    if (MiraiConsole.started) {
-        return
+object ConsoleCS : ConsoleCommandSender() {
+    override suspend fun sendMessage(message: Message) {
+        ConsoleUtils.lineReader.printAbove(message.contentToString())
     }
-    MiraiConsole.started = true
-    this.path = path
-    /* 初始化前端 */
-    this.version = consoleVersion
-    this.frontEnd = frontEnd
-    this.frontEnd.pushVersion(consoleVersion, MiraiConsole.build, coreVersion)
-    logger("Mirai-console now running under $path")
-    logger("Get news in github: https://github.com/mamoe/mirai")
-    logger("Mirai为开源项目，请自觉遵守开源项目协议")
-    logger("Powered by Mamoe Technologies and contributors")
-
-    /* 依次启用功能 */
-    DefaultCommands()
-    PluginManager.loadPlugins()
-    CommandManager.start()
-
-    /* 通知启动完成 */
-    logger("Mirai-console 启动完成")
-    logger("\"login qqnumber qqpassword \" to login a bot")
-    logger("\"login qq号 qq密码 \" 来登录一个BOT")
-
-    /* 尝试从系统配置自动登录 */
-    DefaultCommands.tryLoginAuto()
 }
\ No newline at end of file
diff --git a/frontend/mirai-console-terminal/build.gradle.kts b/frontend/mirai-console-terminal/build.gradle.kts
index 101775f61..cea7f593a 100644
--- a/frontend/mirai-console-terminal/build.gradle.kts
+++ b/frontend/mirai-console-terminal/build.gradle.kts
@@ -20,7 +20,7 @@ kotlin {
         all {
 
             languageSettings.useExperimentalAnnotation("kotlin.Experimental")
-            languageSettings.useExperimentalAnnotation("kotlin.OptIn")
+            languageSettings.useExperimentalAnnotation("kotlin.RequiresOptIn")
             languageSettings.progressiveMode = true
             languageSettings.useExperimentalAnnotation("net.mamoe.mirai.utils.MiraiInternalAPI")
         }
@@ -28,7 +28,7 @@ kotlin {
 }
 
 dependencies {
-    compileOnly("net.mamoe:mirai-core-qqandroid:${Versions.Mirai.core}")
+    compileOnly("net.mamoe:mirai-core-qqandroid:${Versions.core}")
     api(project(":mirai-console"))
     api(group = "com.googlecode.lanterna", name = "lanterna", version = "3.0.2")
 }
diff --git a/gradle/wrapper/gradle-wrapper.properties b/gradle/wrapper/gradle-wrapper.properties
index 77f95ee0c..1ee034fe0 100644
--- a/gradle/wrapper/gradle-wrapper.properties
+++ b/gradle/wrapper/gradle-wrapper.properties
@@ -1,5 +1,5 @@
 #Wed Mar 04 22:27:09 CST 2020
-distributionUrl=https\://services.gradle.org/distributions/gradle-6.3-all.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-6.5-all.zip
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
 zipStorePath=wrapper/dists
diff --git a/settings.gradle b/settings.gradle
deleted file mode 100644
index d63876b77..000000000
--- a/settings.gradle
+++ /dev/null
@@ -1,72 +0,0 @@
-pluginManagement {
-    resolutionStrategy {
-        eachPlugin {
-            switch (requested.id.id) {
-                case "org.jetbrains.kotlin.multiplatform": useModule("org.jetbrains.kotlin:kotlin-gradle-plugin:${requested.version}"); break
-                case "com.android.library": useModule("com.android.tools.build:gradle:${requested.version}"); break
-                case "com.jfrog.bintray": useModule("com.jfrog.bintray.gradle:gradle-bintray-plugin:${requested.version}")
-            }
-        }
-    }
-
-    repositories {
-        mavenLocal()
-        jcenter()
-        google()
-        mavenCentral()
-        maven { url "https://plugins.gradle.org/m2/" }
-        maven { url "https://dl.bintray.com/jetbrains/kotlin-native-dependencies" }
-        maven { url 'https://dl.bintray.com/kotlin/kotlin-eap' }
-        maven { url 'https://plugins.gradle.org/m2/' }
-    }
-}
-
-rootProject.name = 'mirai-console'
-
-def onlyBackEnd = true
-
-include(':mirai-console')
-project(':mirai-console').dir = file("backend/mirai-console")
-
-include(':codegen')
-project(':codegen').dir = file("backend/codegen")
-
-
-if (!onlyBackEnd) {
-
-    include(':mirai-console-pure')
-    project(':mirai-console-pure').dir = file("frontend/mirai-console-pure")
-
-    include(':mirai-console-terminal')
-    project(':mirai-console-terminal').dir = file("frontend/mirai-console-terminal")
-
-    try {
-        def javaVersion = System.getProperty("java.version")
-        def versionPos = javaVersion.indexOf(".")
-        def javaVersionNum = javaVersion.substring(0, 1).toInteger()
-
-        if (javaVersion.startsWith("1.")) {
-            javaVersionNum = javaVersion.substring(2, 3).toInteger()
-        } else {
-            if (versionPos == -1) versionPos = javaVersion.indexOf("-")
-            if (versionPos == -1) {
-                println("jdk version unknown")
-            } else {
-                javaVersionNum = javaVersion.substring(0, versionPos).toInteger()
-            }
-        }
-        if (javaVersionNum >= 9) {
-            include(':mirai-console-graphical')
-            project(':mirai-console-graphical').dir = file("frontend/mirai-console-graphical")
-        } else {
-            println("jdk版本为 " + javaVersionNum)
-            println("当前使用的 JDK 版本为 ${System.getProperty("java.version")},  请使用JDK 9以上版本引入模块 `:mirai-console-graphical`\n")
-        }
-
-    } catch (Exception ignored) {
-        println("无法确定 JDK 版本, 将不会引入 `:mirai-console-graphical`")
-    }
-}
-
-
-enableFeaturePreview('GRADLE_METADATA')
\ No newline at end of file
diff --git a/settings.gradle.kts b/settings.gradle.kts
new file mode 100644
index 000000000..4283675f6
--- /dev/null
+++ b/settings.gradle.kts
@@ -0,0 +1,53 @@
+pluginManagement {
+    repositories {
+        mavenLocal()
+        jcenter()
+        maven(url = "https://dl.bintray.com/kotlin/kotlin-eap")
+        mavenCentral()
+    }
+
+    resolutionStrategy {
+        eachPlugin {
+            val version = requested.version
+            when (requested.id.id) {
+                "org.jetbrains.kotlin.jvm" -> useModule("org.jetbrains.kotlin:kotlin-gradle-plugin:${version}")
+                "org.jetbrains.kotlin.plugin.serialization" -> useModule("org.jetbrains.kotlin:kotlin-serialization:${version}")
+                "com.jfrog.bintray" -> useModule("com.jfrog.bintray.gradle:gradle-bintray-plugin:$version")
+            }
+        }
+    }
+}
+
+rootProject.name = "mirai-console"
+
+val disableOldFrontEnds = true
+
+fun includeProject(projectPath: String, path: String? = null) {
+    include(projectPath)
+    if (path != null) project(projectPath).projectDir = file(path)
+}
+
+includeProject(":mirai-console", "backend/mirai-console")
+includeProject(":mirai-console.codegen", "backend/codegen")
+includeProject(":mirai-console-pure", "frontend/mirai-console-pure")
+
+@Suppress("ConstantConditionIf")
+if (!disableOldFrontEnds) {
+    includeProject(":mirai-console-terminal", "frontend/mirai-console-terminal")
+
+    val jdkVersion = kotlin.runCatching {
+        System.getProperty("java.version").let { v ->
+            v.toIntOrNull() ?: v.removePrefix("1.").substringBefore("-").toIntOrNull()
+        }
+    }.getOrNull() ?: -1
+
+    println("JDK version: $jdkVersion")
+
+    if (jdkVersion >= 9) {
+        includeProject(":mirai-console-graphical", "frontend/mirai-console-graphical")
+    } else {
+        println("当前使用的 JDK 版本为 ${System.getProperty("java.version")},  请使用 JDK 9 以上版本引入模块 `:mirai-console-graphical`\n")
+    }
+}
+
+enableFeaturePreview("GRADLE_METADATA")
\ No newline at end of file