diff --git a/layers/common/python/common/chzzk.py b/layers/common/python/common/chzzk.py
index 40ad481..e04d409 100644
--- a/layers/common/python/common/chzzk.py
+++ b/layers/common/python/common/chzzk.py
@@ -23,13 +23,13 @@ class ChzzkLive:
     liveTitle: str
     status: str
     liveImageUrl: str
-    defaultThumbnailImageUrl: str | None = None
+    defaultThumbnailImageUrl: str | None
     concurrentUserCount: int
     accumulateCount: int
     openDate: str
     closeDate: str
-    adult: bool | None = None
-    chatChannelId: str | None = None
+    adult: bool | None
+    chatChannelId: str | None
     categoryType: str
     liveCategory: str
     liveCategoryValue: str