diff --git a/src/main/kotlin/dev/usbharu/hideout/activitypub/service/activity/undo/APUndoProcessor.kt b/src/main/kotlin/dev/usbharu/hideout/activitypub/service/activity/undo/APUndoProcessor.kt
index 888c31f7..77388337 100644
--- a/src/main/kotlin/dev/usbharu/hideout/activitypub/service/activity/undo/APUndoProcessor.kt
+++ b/src/main/kotlin/dev/usbharu/hideout/activitypub/service/activity/undo/APUndoProcessor.kt
@@ -1,9 +1,6 @@
 package dev.usbharu.hideout.activitypub.service.activity.undo
 
-import dev.usbharu.hideout.activitypub.domain.model.Accept
-import dev.usbharu.hideout.activitypub.domain.model.Block
-import dev.usbharu.hideout.activitypub.domain.model.Follow
-import dev.usbharu.hideout.activitypub.domain.model.Undo
+import dev.usbharu.hideout.activitypub.domain.model.*
 import dev.usbharu.hideout.activitypub.domain.model.objects.ObjectValue
 import dev.usbharu.hideout.activitypub.service.common.AbstractActivityPubProcessor
 import dev.usbharu.hideout.activitypub.service.common.ActivityPubProcessContext
@@ -11,6 +8,8 @@ import dev.usbharu.hideout.activitypub.service.common.ActivityType
 import dev.usbharu.hideout.activitypub.service.objects.user.APUserService
 import dev.usbharu.hideout.application.external.Transaction
 import dev.usbharu.hideout.core.query.ActorQueryService
+import dev.usbharu.hideout.core.query.PostQueryService
+import dev.usbharu.hideout.core.service.reaction.ReactionService
 import dev.usbharu.hideout.core.service.relationship.RelationshipService
 import org.springframework.stereotype.Service
 
@@ -19,7 +18,9 @@ class APUndoProcessor(
     transaction: Transaction,
     private val apUserService: APUserService,
     private val actorQueryService: ActorQueryService,
-    private val relationshipService: RelationshipService
+    private val relationshipService: RelationshipService,
+    private val postQueryService: PostQueryService,
+    private val reactionService: ReactionService
 ) :
     AbstractActivityPubProcessor<Undo>(transaction) {
     override suspend fun internalProcess(activity: ActivityPubProcessContext<Undo>) {
@@ -68,6 +69,18 @@ class APUndoProcessor(
                 val target = actorQueryService.findByUrl(acceptObject)
 
                 relationshipService.rejectFollowRequest(accepter.id, target.id)
+                return
+            }
+
+            "Like" -> {
+                val like = undo.apObject as Like
+
+                val post = postQueryService.findByUrl(like.apObject)
+
+                val actor = actorQueryService.findByUrl(like.actor)
+
+                reactionService.receiveRemoveReaction(actor.id, post.id)
+                return
             }
 
             else -> {}
diff --git a/src/main/kotlin/dev/usbharu/hideout/core/infrastructure/exposedquery/ReactionQueryServiceImpl.kt b/src/main/kotlin/dev/usbharu/hideout/core/infrastructure/exposedquery/ReactionQueryServiceImpl.kt
index b7bd1642..8e51e2e6 100644
--- a/src/main/kotlin/dev/usbharu/hideout/core/infrastructure/exposedquery/ReactionQueryServiceImpl.kt
+++ b/src/main/kotlin/dev/usbharu/hideout/core/infrastructure/exposedquery/ReactionQueryServiceImpl.kt
@@ -6,9 +6,7 @@ import dev.usbharu.hideout.core.infrastructure.exposedrepository.Reactions
 import dev.usbharu.hideout.core.infrastructure.exposedrepository.toReaction
 import dev.usbharu.hideout.core.query.ReactionQueryService
 import dev.usbharu.hideout.util.singleOr
-import org.jetbrains.exposed.sql.SqlExpressionBuilder.eq
 import org.jetbrains.exposed.sql.and
-import org.jetbrains.exposed.sql.deleteWhere
 import org.jetbrains.exposed.sql.select
 import org.springframework.stereotype.Repository
 
@@ -45,7 +43,8 @@ class ReactionQueryServiceImpl : ReactionQueryService {
         }.empty().not()
     }
 
-    override suspend fun deleteByPostIdAndActorId(postId: Long, actorId: Long) {
-        Reactions.deleteWhere { Reactions.postId.eq(postId).and(Reactions.actorId.eq(actorId)) }
+    override suspend fun findByPostIdAndActorId(postId: Long, actorId: Long): List<Reaction> {
+        return Reactions.select { Reactions.postId eq postId and (Reactions.actorId eq actorId) }
+            .map { it.toReaction() }
     }
 }
diff --git a/src/main/kotlin/dev/usbharu/hideout/core/infrastructure/exposedrepository/ReactionRepositoryImpl.kt b/src/main/kotlin/dev/usbharu/hideout/core/infrastructure/exposedrepository/ReactionRepositoryImpl.kt
index a94abda4..e2b8cef7 100644
--- a/src/main/kotlin/dev/usbharu/hideout/core/infrastructure/exposedrepository/ReactionRepositoryImpl.kt
+++ b/src/main/kotlin/dev/usbharu/hideout/core/infrastructure/exposedrepository/ReactionRepositoryImpl.kt
@@ -37,7 +37,7 @@ class ReactionRepositoryImpl(
         Reactions.deleteWhere {
             id.eq(reaction.id)
                 .and(postId.eq(reaction.postId))
-                .and(actorId.eq(reaction.postId))
+                .and(actorId.eq(reaction.actorId))
                 .and(emojiId.eq(reaction.emojiId))
         }
         return reaction
diff --git a/src/main/kotlin/dev/usbharu/hideout/core/query/ReactionQueryService.kt b/src/main/kotlin/dev/usbharu/hideout/core/query/ReactionQueryService.kt
index 602e0a76..ece7b040 100644
--- a/src/main/kotlin/dev/usbharu/hideout/core/query/ReactionQueryService.kt
+++ b/src/main/kotlin/dev/usbharu/hideout/core/query/ReactionQueryService.kt
@@ -12,5 +12,5 @@ interface ReactionQueryService {
 
     suspend fun reactionAlreadyExist(postId: Long, actorId: Long, emojiId: Long): Boolean
 
-    suspend fun deleteByPostIdAndActorId(postId: Long, actorId: Long)
+    suspend fun findByPostIdAndActorId(postId: Long, actorId: Long): List<Reaction>
 }
diff --git a/src/main/kotlin/dev/usbharu/hideout/core/service/reaction/ReactionService.kt b/src/main/kotlin/dev/usbharu/hideout/core/service/reaction/ReactionService.kt
index 333deb1d..38121bb6 100644
--- a/src/main/kotlin/dev/usbharu/hideout/core/service/reaction/ReactionService.kt
+++ b/src/main/kotlin/dev/usbharu/hideout/core/service/reaction/ReactionService.kt
@@ -5,6 +5,7 @@ import org.springframework.stereotype.Service
 @Service
 interface ReactionService {
     suspend fun receiveReaction(name: String, domain: String, actorId: Long, postId: Long)
+    suspend fun receiveRemoveReaction(actorId: Long, postId: Long)
     suspend fun sendReaction(name: String, actorId: Long, postId: Long)
     suspend fun removeReaction(actorId: Long, postId: Long)
 }
diff --git a/src/main/kotlin/dev/usbharu/hideout/core/service/reaction/ReactionServiceImpl.kt b/src/main/kotlin/dev/usbharu/hideout/core/service/reaction/ReactionServiceImpl.kt
index 1e9be539..0323dc97 100644
--- a/src/main/kotlin/dev/usbharu/hideout/core/service/reaction/ReactionServiceImpl.kt
+++ b/src/main/kotlin/dev/usbharu/hideout/core/service/reaction/ReactionServiceImpl.kt
@@ -27,6 +27,11 @@ class ReactionServiceImpl(
         }
     }
 
+    override suspend fun receiveRemoveReaction(actorId: Long, postId: Long) {
+        val reaction = reactionQueryService.findByPostIdAndActorIdAndEmojiId(postId, actorId, 0)
+        reactionRepository.delete(reaction)
+    }
+
     override suspend fun sendReaction(name: String, actorId: Long, postId: Long) {
         try {
             val findByPostIdAndUserIdAndEmojiId =