diff --git a/src/main/kotlin/kr/co/vividnext/sodalive/creator/admin/content/series/CreatorAdminContentSeriesService.kt b/src/main/kotlin/kr/co/vividnext/sodalive/creator/admin/content/series/CreatorAdminContentSeriesService.kt
index 49b6f63..5a12f83 100644
--- a/src/main/kotlin/kr/co/vividnext/sodalive/creator/admin/content/series/CreatorAdminContentSeriesService.kt
+++ b/src/main/kotlin/kr/co/vividnext/sodalive/creator/admin/content/series/CreatorAdminContentSeriesService.kt
@@ -242,7 +242,7 @@ class CreatorAdminContentSeriesService(
         }
 
         if (seriesContentList.size > 0) {
-            series.contentList.addAll(seriesContentList)
+            series.contentList.addAll(seriesContentList.toSet())
         } else {
             throw SodaException("추가된 콘텐츠가 없습니다.")
         }