diff --git a/backend/src/main/java/mouda/backend/chat/presentation/response/ChatFindDetailResponse.java b/backend/src/main/java/mouda/backend/chat/presentation/response/ChatFindDetailResponse.java
index 2b1bf7bc..a9c7196a 100644
--- a/backend/src/main/java/mouda/backend/chat/presentation/response/ChatFindDetailResponse.java
+++ b/backend/src/main/java/mouda/backend/chat/presentation/response/ChatFindDetailResponse.java
@@ -34,6 +34,6 @@ public static ChatFindDetailResponse toResponse(ChatOwnership chatOwnership) {
 
 	private static ParticipantResponse getParticipantResponse(ChatOwnership chatOwnership) {
 		Author author = chatOwnership.getChat().getAuthor();
-		return new ParticipantResponse(author.getNickname(), author.getProfile());
+		return new ParticipantResponse(author.getDarakbangMemberId(), author.getNickname(), author.getProfile());
 	}
 }
diff --git a/backend/src/main/java/mouda/backend/chat/presentation/response/ChatPreviewResponse.java b/backend/src/main/java/mouda/backend/chat/presentation/response/ChatPreviewResponse.java
index eac3eaa4..6928d900 100644
--- a/backend/src/main/java/mouda/backend/chat/presentation/response/ChatPreviewResponse.java
+++ b/backend/src/main/java/mouda/backend/chat/presentation/response/ChatPreviewResponse.java
@@ -30,7 +30,11 @@ public static ChatPreviewResponse toResponse(ChatPreview chatPreview) {
 
 	private static List<ParticipantResponse> getParticipants(ChatPreview chatPreview) {
 		return chatPreview.getParticipants().stream()
-			.map(participant -> new ParticipantResponse(participant.getNickname(), participant.getProfile(), participant.getRole()))
+			.map(participant -> new ParticipantResponse(
+				participant.getDarakbangMemberId(),
+				participant.getNickname(),
+				participant.getProfile(),
+				participant.getRole()))
 			.toList();
 	}
 }
diff --git a/backend/src/main/java/mouda/backend/chat/presentation/response/ParticipantResponse.java b/backend/src/main/java/mouda/backend/chat/presentation/response/ParticipantResponse.java
index ea1d1ddc..caf4944e 100644
--- a/backend/src/main/java/mouda/backend/chat/presentation/response/ParticipantResponse.java
+++ b/backend/src/main/java/mouda/backend/chat/presentation/response/ParticipantResponse.java
@@ -1,12 +1,13 @@
 package mouda.backend.chat.presentation.response;
 
 public record ParticipantResponse(
+	long darakbangMemberId,
 	String nickname,
 	String profile,
 	String role
 ) {
 
-	public ParticipantResponse(String nickname, String profile) {
-		this(nickname, profile, null);
+	public ParticipantResponse(long darakbangMemberId, String nickname, String profile) {
+		this(darakbangMemberId, nickname, profile, null);
 	}
 }