diff --git a/notification/src/main/kotlin/com/backgu/amaker/notification/service/adapter/RealTimeUserHandlerAdapter.kt b/notification/src/main/kotlin/com/backgu/amaker/notification/service/adapter/RealTimeUserHandlerAdapter.kt
index 8c9e8c8e..7d82cac8 100644
--- a/notification/src/main/kotlin/com/backgu/amaker/notification/service/adapter/RealTimeUserHandlerAdapter.kt
+++ b/notification/src/main/kotlin/com/backgu/amaker/notification/service/adapter/RealTimeUserHandlerAdapter.kt
@@ -33,9 +33,10 @@ class RealTimeUserHandlerAdapter(
         val realTimeServerSet: Set<RealTimeServer> =
             realTimeService.findByIdsToSet(sessions.mapTo(mutableSetOf()) { it.realtimeId })
         val successUser =
-            realTimeServerSet.map {
-                realTimeHandler.handleUserRealTimeNotification(listOf(notification.userId), it, notification)
-            }
+            realTimeServerSet
+                .map {
+                    realTimeHandler.handleUserRealTimeNotification(notification.userId, it, notification)
+                }.flatten()
 
         if (successUser.isEmpty()) {
             applicationEventPublisher.publishEvent(