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 09504af..49b6f63 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
@@ -253,7 +253,6 @@ class CreatorAdminContentSeriesService(
         val series = repository.findByIdAndCreatorId(id = request.seriesId, creatorId = memberId)
             ?: throw SodaException("잘못된 접근입니다.")
 
-        val removeContentList = series.contentList.filter { it.content!!.id == request.contentId }
-        series.contentList.removeAll(removeContentList)
+        series.contentList.removeIf { it.content!!.id == request.contentId }
     }
 }
diff --git a/src/main/kotlin/kr/co/vividnext/sodalive/creator/admin/content/series/Series.kt b/src/main/kotlin/kr/co/vividnext/sodalive/creator/admin/content/series/Series.kt
index ca2ef30..00c9866 100644
--- a/src/main/kotlin/kr/co/vividnext/sodalive/creator/admin/content/series/Series.kt
+++ b/src/main/kotlin/kr/co/vividnext/sodalive/creator/admin/content/series/Series.kt
@@ -51,10 +51,10 @@ data class Series(
 
     var coverImage: String? = null
 
-    @OneToMany(mappedBy = "series", cascade = [CascadeType.ALL])
+    @OneToMany(mappedBy = "series", cascade = [CascadeType.ALL], orphanRemoval = true)
     var contentList: MutableList<SeriesContent> = mutableListOf()
 
-    @OneToMany(mappedBy = "series", cascade = [CascadeType.ALL])
+    @OneToMany(mappedBy = "series", cascade = [CascadeType.ALL], orphanRemoval = true)
     var keywordList: MutableList<SeriesKeyword> = mutableListOf()
 
     fun toDetailResponse(imageHost: String): GetCreatorAdminContentSeriesDetailResponse {