diff --git a/src/messages/messages.controller.ts b/src/messages/messages.controller.ts
index a387b96..90cf02a 100644
--- a/src/messages/messages.controller.ts
+++ b/src/messages/messages.controller.ts
@@ -215,7 +215,23 @@ export class MessagesController {
     @Param('id') conversationId: string,
     @CurrentUser('id') userId: string,
   ) {
-    return this.messagesService.markMessagesAsRead(conversationId, userId);
+    const result = await this.messagesService.markMessagesAsRead(conversationId, userId);
+
+    // Emit socket event so sender gets real-time blue tick
+    const participants = await this.messagesService.getConversationParticipants(conversationId);
+    if (participants) {
+      const otherUserId = userId === participants.userId
+        ? participants.agentUserId
+        : participants.userId;
+      const readEvent = {
+        conversationId,
+        readBy: userId,
+        readAt: new Date(),
+      };
+      this.messagesGateway.sendToUser(otherUserId, 'messages_read', readEvent);
+    }
+
+    return result;
   }
 
   // ==========================================