diff --git a/matrix_appservice_kakaotalk/kt/types/chat/attachment/reply.py b/matrix_appservice_kakaotalk/kt/types/chat/attachment/reply.py
index 5f861c2..784d3c4 100644
--- a/matrix_appservice_kakaotalk/kt/types/chat/attachment/reply.py
+++ b/matrix_appservice_kakaotalk/kt/types/chat/attachment/reply.py
@@ -25,11 +25,11 @@ from .mention import MentionStruct
 
 @dataclass(kw_only=True)
 class ReplyAttachment(Attachment):
-    attach_only: bool
+    attach_only: bool = None # NOTE Made optional
     attach_type: Optional[ChatType] = None # NOTE Changed from int for outgoing typeless replies
     src_linkId: Optional[Long] = None
     src_logId: Long
-    src_mentions: list[MentionStruct]
+    src_mentions: list[MentionStruct] = None # NOTE Made optional
     src_message: str
     src_type: ChatType
     src_userId: Long