diff --git a/src/main/kotlin/kr/co/vividnext/sodalive/content/series/ContentSeriesRepository.kt b/src/main/kotlin/kr/co/vividnext/sodalive/content/series/ContentSeriesRepository.kt
index bbffba9..3421838 100644
--- a/src/main/kotlin/kr/co/vividnext/sodalive/content/series/ContentSeriesRepository.kt
+++ b/src/main/kotlin/kr/co/vividnext/sodalive/content/series/ContentSeriesRepository.kt
@@ -120,7 +120,7 @@ class ContentSeriesQueryRepositoryImpl(
                     Expressions.constant(0),
                     Expressions.constant(0),
                     Expressions.constant<List<String>>(emptyList()),
-                    Expressions.constant<String?>(null)
+                    Expressions.constant("")
                 )
             )
             .from(series)
diff --git a/src/main/kotlin/kr/co/vividnext/sodalive/content/series/GetSeriesDetailResponse.kt b/src/main/kotlin/kr/co/vividnext/sodalive/content/series/GetSeriesDetailResponse.kt
index ffbb94e..e9bb8d3 100644
--- a/src/main/kotlin/kr/co/vividnext/sodalive/content/series/GetSeriesDetailResponse.kt
+++ b/src/main/kotlin/kr/co/vividnext/sodalive/content/series/GetSeriesDetailResponse.kt
@@ -19,7 +19,7 @@ data class GetSeriesDetailResponse @QueryProjection constructor(
     var minPrice: Int,
     var maxPrice: Int,
     var keywordList: List<String>,
-    var publishedDaysOfWeek: String?
+    var publishedDaysOfWeek: String
 ) {
     data class GetSeriesDetailCreator @QueryProjection constructor(
         val creatorId: Long,
@@ -29,6 +29,6 @@ data class GetSeriesDetailResponse @QueryProjection constructor(
     )
 
     fun validate(): Boolean {
-        return keywordList.isNotEmpty() && !publishedDaysOfWeek.isNullOrBlank()
+        return keywordList.isNotEmpty() && publishedDaysOfWeek.isBlank()
     }
 }