diff --git a/mirai-core/src/commonMain/kotlin/contact/AbstractMember.kt b/mirai-core/src/commonMain/kotlin/contact/AbstractMember.kt
new file mode 100644
index 000000000..0e9075df6
--- /dev/null
+++ b/mirai-core/src/commonMain/kotlin/contact/AbstractMember.kt
@@ -0,0 +1,32 @@
+/*
+ * 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.internal.contact
+
+import net.mamoe.mirai.contact.Member
+import net.mamoe.mirai.contact.MemberPermission
+import net.mamoe.mirai.data.MemberInfo
+import net.mamoe.mirai.utils.cast
+import net.mamoe.mirai.utils.getValue
+import net.mamoe.mirai.utils.unsafeWeakRef
+import kotlin.coroutines.CoroutineContext
+
+internal abstract class AbstractMember(
+    group: GroupImpl,
+    coroutineContext: CoroutineContext,
+    memberInfo: MemberInfo
+) : AbstractUser(group.bot, coroutineContext, memberInfo), Member {
+    final override val group: GroupImpl by group.unsafeWeakRef()
+
+    final override val info: MemberInfoImpl = memberInfo.cast()
+
+    override val nameCard: String get() = info.nameCard
+    override val specialTitle: String get() = info.specialTitle
+    override var permission: MemberPermission by info::permission
+}
\ No newline at end of file
diff --git a/mirai-core/src/commonMain/kotlin/contact/AbstractUser.kt b/mirai-core/src/commonMain/kotlin/contact/AbstractUser.kt
index b6ddb9299..c3a8024dc 100644
--- a/mirai-core/src/commonMain/kotlin/contact/AbstractUser.kt
+++ b/mirai-core/src/commonMain/kotlin/contact/AbstractUser.kt
@@ -27,14 +27,13 @@ import net.mamoe.mirai.internal.network.highway.sizeToString
 import net.mamoe.mirai.internal.network.protocol.data.proto.Cmd0x352
 import net.mamoe.mirai.internal.network.protocol.packet.chat.image.LongConn
 import net.mamoe.mirai.message.data.Image
-import net.mamoe.mirai.utils.ExternalResource
-import net.mamoe.mirai.utils.generateImageIdFromResourceId
-import net.mamoe.mirai.utils.toUHexString
-import net.mamoe.mirai.utils.verbose
+import net.mamoe.mirai.utils.*
 import kotlin.coroutines.CoroutineContext
 import kotlin.math.roundToInt
 import kotlin.time.measureTime
 
+internal val User.info: UserInfo? get() = this.castOrNull<AbstractUser>()?.info
+
 internal open class UserInfoImpl(override val uin: Long, override val nick: String, override val remark: String = "") :
     UserInfo
 
@@ -47,6 +46,8 @@ internal abstract class AbstractUser(
     final override var nick: String = userInfo.nick
     final override val remark: String = userInfo.remark
 
+    open val info: UserInfo = userInfo
+
     @Suppress("INVISIBLE_MEMBER", "INVISIBLE_REFERENCE")
     override suspend fun uploadImage(resource: ExternalResource): Image {
         if (BeforeImageUploadEvent(this, resource).broadcast().isCancelled) {
diff --git a/mirai-core/src/commonMain/kotlin/contact/AnonymousMemberImpl.kt b/mirai-core/src/commonMain/kotlin/contact/AnonymousMemberImpl.kt
index c2d6f71db..888ce81b7 100644
--- a/mirai-core/src/commonMain/kotlin/contact/AnonymousMemberImpl.kt
+++ b/mirai-core/src/commonMain/kotlin/contact/AnonymousMemberImpl.kt
@@ -9,31 +9,25 @@
 
 package net.mamoe.mirai.internal.contact
 
-import net.mamoe.mirai.Bot
 import net.mamoe.mirai.contact.AnonymousMember
-import net.mamoe.mirai.contact.MemberPermission
 import net.mamoe.mirai.data.MemberInfo
 import net.mamoe.mirai.internal.MiraiImpl
+import net.mamoe.mirai.message.data.Image
+import net.mamoe.mirai.utils.ExternalResource
 import kotlin.coroutines.CoroutineContext
 
 internal class AnonymousMemberImpl(
-    override val group: GroupImpl,
-    override val coroutineContext: CoroutineContext,
-    private val memberInfo: MemberInfo,
+    group: GroupImpl,
+    coroutineContext: CoroutineContext,
+    memberInfo: MemberInfo,
     override val anonymousId: String
-) : AnonymousMember {
-    override val nameCard: String get() = memberInfo.nameCard
-    override val specialTitle: String get() = memberInfo.specialTitle
-    override val permission: MemberPermission get() = memberInfo.permission
-    override val bot: Bot get() = group.bot
-    override val id: Long get() = memberInfo.uin
-    override val nick: String get() = memberInfo.nick
-    override val remark: String get() = memberInfo.remark
-
+) : AnonymousMember, AbstractMember(group, coroutineContext, memberInfo) {
     override suspend fun mute(durationSeconds: Int) {
         checkBotPermissionHigherThanThis("mute")
         MiraiImpl.muteAnonymousMember(bot, anonymousId, nameCard, group.uin, durationSeconds)
     }
 
     override fun toString(): String = "AnonymousMember($nameCard, $anonymousId)"
+    override suspend fun uploadImage(resource: ExternalResource): Image =
+        throw UnsupportedOperationException("Cannot upload image to AnonymousMember")
 }
diff --git a/mirai-core/src/commonMain/kotlin/contact/MemberInfoImpl.kt b/mirai-core/src/commonMain/kotlin/contact/MemberInfoImpl.kt
index f80514b42..a3cbbefd8 100644
--- a/mirai-core/src/commonMain/kotlin/contact/MemberInfoImpl.kt
+++ b/mirai-core/src/commonMain/kotlin/contact/MemberInfoImpl.kt
@@ -16,7 +16,7 @@ import net.mamoe.mirai.internal.network.protocol.data.jce.StTroopMemberInfo
 internal class MemberInfoImpl(
     override val uin: Long,
     override var nick: String,
-    override val permission: MemberPermission,
+    override var permission: MemberPermission,
     override var remark: String,
     override val nameCard: String,
     override val specialTitle: String,
diff --git a/mirai-core/src/commonMain/kotlin/contact/NormalMemberImpl.kt b/mirai-core/src/commonMain/kotlin/contact/NormalMemberImpl.kt
index 7734af435..e33310b7f 100644
--- a/mirai-core/src/commonMain/kotlin/contact/NormalMemberImpl.kt
+++ b/mirai-core/src/commonMain/kotlin/contact/NormalMemberImpl.kt
@@ -28,8 +28,6 @@ import net.mamoe.mirai.internal.network.protocol.packet.chat.receive.createToTem
 import net.mamoe.mirai.message.MessageReceipt
 import net.mamoe.mirai.message.data.*
 import net.mamoe.mirai.utils.currentTimeSeconds
-import net.mamoe.mirai.utils.getValue
-import net.mamoe.mirai.utils.unsafeWeakRef
 import kotlin.contracts.ExperimentalContracts
 import kotlin.contracts.contract
 import kotlin.coroutines.CoroutineContext
@@ -40,8 +38,7 @@ internal class NormalMemberImpl constructor(
     group: GroupImpl,
     coroutineContext: CoroutineContext,
     memberInfo: MemberInfo
-) : NormalMember, AbstractUser(group.bot, coroutineContext, memberInfo) {
-    override val group: GroupImpl by group.unsafeWeakRef()
+) : NormalMember, AbstractMember(group, coroutineContext, memberInfo) {
 
     @Suppress("unused") // false positive
     val lastMessageSequence: AtomicInt = atomic(-1)
@@ -108,8 +105,6 @@ internal class NormalMemberImpl constructor(
         return result.getOrThrow()
     }
 
-    override var permission: MemberPermission = memberInfo.permission
-
     @Suppress("PropertyName")
     internal var _nameCard: String = memberInfo.nameCard
 
diff --git a/mirai-core/src/commonMain/kotlin/network/protocol/packet/chat/receive/OnlinePush.PbPushGroupMsg.kt b/mirai-core/src/commonMain/kotlin/network/protocol/packet/chat/receive/OnlinePush.PbPushGroupMsg.kt
index 4a8a2d152..26ad43240 100644
--- a/mirai-core/src/commonMain/kotlin/network/protocol/packet/chat/receive/OnlinePush.PbPushGroupMsg.kt
+++ b/mirai-core/src/commonMain/kotlin/network/protocol/packet/chat/receive/OnlinePush.PbPushGroupMsg.kt
@@ -22,9 +22,7 @@ import net.mamoe.mirai.event.events.GroupMessageEvent
 import net.mamoe.mirai.event.events.GroupMessageSyncEvent
 import net.mamoe.mirai.event.events.MemberCardChangeEvent
 import net.mamoe.mirai.internal.QQAndroidBot
-import net.mamoe.mirai.internal.contact.GroupImpl
-import net.mamoe.mirai.internal.contact.NormalMemberImpl
-import net.mamoe.mirai.internal.contact.newAnonymous
+import net.mamoe.mirai.internal.contact.*
 import net.mamoe.mirai.internal.message.toMessageChain
 import net.mamoe.mirai.internal.network.Packet
 import net.mamoe.mirai.internal.network.protocol.data.proto.ImMsgBody