diff --git a/src/main/kotlin/kr/co/vividnext/sodalive/v2/usercreatorchat/service/UserCreatorChatService.kt b/src/main/kotlin/kr/co/vividnext/sodalive/v2/usercreatorchat/service/UserCreatorChatService.kt
index 06fcdcdf..a3fe8629 100644
--- a/src/main/kotlin/kr/co/vividnext/sodalive/v2/usercreatorchat/service/UserCreatorChatService.kt
+++ b/src/main/kotlin/kr/co/vividnext/sodalive/v2/usercreatorchat/service/UserCreatorChatService.kt
@@ -8,6 +8,7 @@ import kr.co.vividnext.sodalive.fcm.FcmEvent
 import kr.co.vividnext.sodalive.fcm.FcmEventType
 import kr.co.vividnext.sodalive.fcm.notification.PushNotificationCategory
 import kr.co.vividnext.sodalive.member.Member
+import kr.co.vividnext.sodalive.member.MemberKind
 import kr.co.vividnext.sodalive.member.MemberRepository
 import kr.co.vividnext.sodalive.member.block.BlockMemberRepository
 import kr.co.vividnext.sodalive.utils.generateFileName
@@ -209,6 +210,9 @@ class UserCreatorChatService(
 
     private fun validateRecipient(sender: Member, recipient: Member) {
         if (!recipient.isActive) throw SodaException(messageKey = "message.error.recipient_inactive")
+        if (recipient.memberKind == MemberKind.AI_CHARACTER) {
+            throw SodaException(messageKey = "message.error.recipient_not_found")
+        }
         if (sender.id == recipient.id) throw SodaException(messageKey = "common.error.invalid_request")
         if (blockMemberRepository.isBlocked(blockedMemberId = sender.id!!, memberId = recipient.id!!)) {
             throw SodaException(messageKey = "message.error.blocked_by_recipient")
diff --git a/src/test/kotlin/kr/co/vividnext/sodalive/v2/usercreatorchat/UserCreatorChatServiceIntegrationTest.kt b/src/test/kotlin/kr/co/vividnext/sodalive/v2/usercreatorchat/UserCreatorChatServiceIntegrationTest.kt
new file mode 100644
index 00000000..057a6db4
--- /dev/null
+++ b/src/test/kotlin/kr/co/vividnext/sodalive/v2/usercreatorchat/UserCreatorChatServiceIntegrationTest.kt
@@ -0,0 +1,86 @@
+package kr.co.vividnext.sodalive.v2.usercreatorchat
+
+import kr.co.vividnext.sodalive.common.SodaException
+import kr.co.vividnext.sodalive.member.Member
+import kr.co.vividnext.sodalive.member.MemberKind
+import kr.co.vividnext.sodalive.member.MemberRepository
+import kr.co.vividnext.sodalive.member.MemberRole
+import kr.co.vividnext.sodalive.support.EmbeddedRedisInitializer
+import kr.co.vividnext.sodalive.v2.usercreatorchat.dto.SendUserCreatorTextMessageRequest
+import kr.co.vividnext.sodalive.v2.usercreatorchat.repository.UserCreatorChatMessageRepository
+import kr.co.vividnext.sodalive.v2.usercreatorchat.repository.UserCreatorChatParticipantRepository
+import kr.co.vividnext.sodalive.v2.usercreatorchat.repository.UserCreatorChatRoomRepository
+import kr.co.vividnext.sodalive.v2.usercreatorchat.service.UserCreatorChatService
+import org.junit.jupiter.api.Assertions.assertEquals
+import org.junit.jupiter.api.Assertions.assertThrows
+import org.junit.jupiter.api.DisplayName
+import org.junit.jupiter.api.Test
+import org.springframework.beans.factory.annotation.Autowired
+import org.springframework.boot.test.context.SpringBootTest
+import org.springframework.test.context.ContextConfiguration
+import org.springframework.transaction.annotation.Transactional
+import javax.persistence.EntityManager
+
+@SpringBootTest
+@Transactional
+@ContextConfiguration(initializers = [EmbeddedRedisInitializer::class])
+class UserCreatorChatServiceIntegrationTest @Autowired constructor(
+    private val service: UserCreatorChatService,
+    private val memberRepository: MemberRepository,
+    private val roomRepository: UserCreatorChatRoomRepository,
+    private val participantRepository: UserCreatorChatParticipantRepository,
+    private val messageRepository: UserCreatorChatMessageRepository,
+    private val entityManager: EntityManager
+) {
+    @Test
+    @DisplayName("AI 캐릭터용 Member와는 유저-크리에이터 DM 방을 생성할 수 없다")
+    fun shouldRejectCreateRoomWhenCreatorIsAiCharacterMember() {
+        val user = memberRepository.save(Member(email = "dm-user@test.com", password = "pw", nickname = "user"))
+        val creator = memberRepository.save(
+            Member(
+                email = null,
+                password = "",
+                nickname = "ai-character",
+                role = MemberRole.CREATOR,
+                memberKind = MemberKind.AI_CHARACTER
+            )
+        )
+        entityManager.flush()
+        entityManager.clear()
+
+        val exception = assertThrows(SodaException::class.java) {
+            service.createOrGetRoom(user, creator.id!!)
+        }
+
+        assertEquals("message.error.recipient_not_found", exception.messageKey)
+        assertEquals(0, roomRepository.findAll().size)
+        assertEquals(0, participantRepository.findAll().size)
+    }
+
+    @Test
+    @DisplayName("AI 캐릭터용 Member가 참여한 기존 DM 방에는 메시지를 보낼 수 없다")
+    fun shouldRejectSendTextMessageWhenOpponentIsAiCharacterMember() {
+        val user = memberRepository.save(Member(email = "dm-message-user@test.com", password = "pw", nickname = "user"))
+        val creator = memberRepository.save(
+            Member(
+                email = null,
+                password = "",
+                nickname = "ai-character-message",
+                role = MemberRole.CREATOR,
+                memberKind = MemberKind.AI_CHARACTER
+            )
+        )
+        val room = roomRepository.save(UserCreatorChatRoom())
+        participantRepository.save(UserCreatorChatParticipant(room, user))
+        participantRepository.save(UserCreatorChatParticipant(room, creator))
+        entityManager.flush()
+        entityManager.clear()
+
+        val exception = assertThrows(SodaException::class.java) {
+            service.sendTextMessage(user, room.id!!, SendUserCreatorTextMessageRequest("hello"))
+        }
+
+        assertEquals("message.error.recipient_not_found", exception.messageKey)
+        assertEquals(0, messageRepository.findAll().size)
+    }
+}