diff --git a/src/main/kotlin/com/teamapi/palette/entity/qna/PromptData.kt b/src/main/kotlin/com/teamapi/palette/entity/qna/PromptData.kt
index 1547f1d..4706ce7 100644
--- a/src/main/kotlin/com/teamapi/palette/entity/qna/PromptData.kt
+++ b/src/main/kotlin/com/teamapi/palette/entity/qna/PromptData.kt
@@ -74,7 +74,7 @@ sealed class ChatQuestion(val type: PromptType) {
     data class SelectableQuestion(val choices: List<PromptData.Selectable.Choice>) : ChatQuestion(PromptType.SELECTABLE)
 
     @Serializable
-    data class GridQuestion(val xSize: Int, val ySize: Int) : ChatQuestion(PromptType.GRID)
+    data class GridQuestion(val xSize: Int, val ySize: Int, val maxCount: Int) : ChatQuestion(PromptType.GRID)
 
     @Serializable
     data object UserInputQuestion : ChatQuestion(PromptType.USER_INPUT)
diff --git a/src/main/kotlin/com/teamapi/palette/response/ErrorCode.kt b/src/main/kotlin/com/teamapi/palette/response/ErrorCode.kt
index df88463..2400b2b 100644
--- a/src/main/kotlin/com/teamapi/palette/response/ErrorCode.kt
+++ b/src/main/kotlin/com/teamapi/palette/response/ErrorCode.kt
@@ -31,7 +31,7 @@ enum class ErrorCode(
     QNA_INVALID_CHOICES(HttpStatus.BAD_REQUEST, "적절하지 않은 선택: '%s'. %s 선택지 중 하나가 필요합니다."),
     QNA_INVALID_GRID_CHOICES(HttpStatus.BAD_REQUEST, "적절하지 않은 그리드: (%s). 0~%d 선택지 중 하나가 필요합니다."),
     QNA_INVALID_GRID_DUPE(HttpStatus.BAD_REQUEST, "적절하지 않은 그리드: 중복이 없어야 합니다. possible dupes: (%s)"),
-    QNA_INVALID_GRID_ABOVE_MAX(HttpStatus.BAD_REQUEST, "적절하지 않은 그리드: 너무 많은 선택지. 최대 크기는 %d입니다."),
+    QNA_INVALID_GRID_ABOVE_MAX(HttpStatus.BAD_REQUEST, "적절하지 않은 그리드: 너무 많은 선택지. 최대 크기는 '%d'입니다."),
     ;
 
     override fun getName() = name
diff --git a/src/main/kotlin/com/teamapi/palette/service/ChatService.kt b/src/main/kotlin/com/teamapi/palette/service/ChatService.kt
index c6c3e5e..65ebbed 100644
--- a/src/main/kotlin/com/teamapi/palette/service/ChatService.kt
+++ b/src/main/kotlin/com/teamapi/palette/service/ChatService.kt
@@ -73,7 +73,7 @@ class ChatService(
 
             is ChatAnswer.GridAnswer -> {
                 val grid = pendingQuestion as PromptData.Grid
-                val maxSize = grid.question.xSize * grid.question.ySize
+                val maxSize = grid.question.maxCount
                 val exceeds = message.choice.filter { it >= maxSize }
                 if (exceeds.isNotEmpty())
                     throw CustomException(ErrorCode.QNA_INVALID_GRID_CHOICES, exceeds.joinToString(", "), maxSize - 1)
diff --git a/src/main/kotlin/com/teamapi/palette/service/RoomService.kt b/src/main/kotlin/com/teamapi/palette/service/RoomService.kt
index c500a3e..40c159f 100644
--- a/src/main/kotlin/com/teamapi/palette/service/RoomService.kt
+++ b/src/main/kotlin/com/teamapi/palette/service/RoomService.kt
@@ -56,7 +56,7 @@ class RoomService(
                         ),
                         PromptData.UserInput("product_explanation"),
                         PromptData.UserInput("title"),
-                        PromptData.Grid("title_position", ChatQuestion.GridQuestion(3, 3))
+                        PromptData.Grid("title_position", ChatQuestion.GridQuestion(1, 3, 1))
                     )
                 )
             )