diff --git a/src/main/scala/cc/sukazyo/cono/morny/bot/api/EventEnv.scala b/src/main/scala/cc/sukazyo/cono/morny/bot/api/EventEnv.scala
index 33750c6..9feb720 100644
--- a/src/main/scala/cc/sukazyo/cono/morny/bot/api/EventEnv.scala
+++ b/src/main/scala/cc/sukazyo/cono/morny/bot/api/EventEnv.scala
@@ -51,6 +51,20 @@ class EventEnv (
 			case None => ConsumeResult(false)
 	}
 	
+	// fixme: defined() series is not tested yet
+	
+	def defined [T: ClassTag]: Boolean = {
+		variables get classTag[T].runtimeClass match
+			case Some(_) => true
+			case None => false
+	}
+	
+	def defined [T] (t: Class[T]): Boolean = {
+		variables get t match
+			case Some(_) => true
+			case None => false
+	}
+	
 	def consume [T: ClassTag] (consumer: T => Unit): ConsumeResult =
 		variables get classTag[T].runtimeClass match
 			case Some(i) => consumer(i.asInstanceOf[T]); ConsumeResult(true)
diff --git a/src/main/scala/cc/sukazyo/cono/morny/bot/event/MornyEventListeners.scala b/src/main/scala/cc/sukazyo/cono/morny/bot/event/MornyEventListeners.scala
index 0e05d4c..744437f 100644
--- a/src/main/scala/cc/sukazyo/cono/morny/bot/event/MornyEventListeners.scala
+++ b/src/main/scala/cc/sukazyo/cono/morny/bot/event/MornyEventListeners.scala
@@ -11,10 +11,10 @@ class MornyEventListeners (using manager: EventListenerManager) (using coeur: Mo
 		// KUOHUANHUAN_NEED_SLEEP
 		OnOnAlias(),
 		OnUniMeowTrigger(using coeur.commands),
+		OnQuestionMarkReply(),
 		$OnUserRandom.RandomSelect,
 		//noinspection NonAsciiCharacters
 		$OnUserRandom.尊嘟假嘟,
-		OnQuestionMarkReply(),
 		OnUserSlashAction(),
 		OnCallMe(),
 		OnCallMsgSend(),
diff --git a/src/main/scala/cc/sukazyo/cono/morny/bot/event/OnQuestionMarkReply.scala b/src/main/scala/cc/sukazyo/cono/morny/bot/event/OnQuestionMarkReply.scala
index 177f400..f12d258 100644
--- a/src/main/scala/cc/sukazyo/cono/morny/bot/event/OnQuestionMarkReply.scala
+++ b/src/main/scala/cc/sukazyo/cono/morny/bot/event/OnQuestionMarkReply.scala
@@ -16,12 +16,7 @@ class OnQuestionMarkReply (using coeur: MornyCoeur) extends EventListener {
 		import event.update
 		
 		// FIXME: not tested yet, due to cannot connect to test bot
-		if boundary[Boolean] {
-			event.consume[MornyOnUpdateTimestampOffsetLock.ExpiredEvent.type] { _ =>
-				boundary.break(true)
-			}
-			false
-		} then {
+		if event.defined[MornyOnUpdateTimestampOffsetLock.ExpiredEvent.type] then {
 			logger.debug("OnQuestionMarkReply: expired event, skipped")
 			return
 		} else {
@@ -32,8 +27,12 @@ class OnQuestionMarkReply (using coeur: MornyCoeur) extends EventListener {
 		
 		import cc.sukazyo.cono.morny.util.UseMath.over
 		import cc.sukazyo.cono.morny.util.UseRandom.chance_is
-		if (1 over 8) chance_is false then return;
 		if !isAllMessageMark(using update.message.text) then return;
+		// provide a mark to notify the following event
+		//   that the current event is all made of question marks
+		event.provide(OnQuestionMarkReply.Marked)
+		
+		if (1 over 8) chance_is false then return;
 		
 		if (update.message.hasProtectedContent) {
 			// Copy the message
@@ -77,4 +76,6 @@ object OnQuestionMarkReply {
 		}
 	}
 	
+	object Marked
+	
 }
diff --git a/src/main/scala/cc/sukazyo/cono/morny/bot/event/OnUserRandom.scala b/src/main/scala/cc/sukazyo/cono/morny/bot/event/OnUserRandom.scala
index ac05d02..55b5dd0 100644
--- a/src/main/scala/cc/sukazyo/cono/morny/bot/event/OnUserRandom.scala
+++ b/src/main/scala/cc/sukazyo/cono/morny/bot/event/OnUserRandom.scala
@@ -29,7 +29,8 @@ class OnUserRandom (using coeur: MornyCoeur) {
 					if rand_half then _con1 else _con2
 				case USER_IF_QUERY(_con) =>
 					// for capability with [[OnQuestionMarkReply]]
-					if OnQuestionMarkReply.isAllMessageMark(using _con) then return;
+					//   fixme: not tested yet
+					if event.defined[OnQuestionMarkReply.Marked.type] then return;
 					(if rand_half then "不" else "") + _con
 				case _ => null