diff --git a/app/websocket/src/main/kotlin/com/xorker/draw/websocket/message/response/MafiaPhaseMessengerImpl.kt b/app/websocket/src/main/kotlin/com/xorker/draw/websocket/message/response/MafiaPhaseMessengerImpl.kt
index 762d7a07..6065a6a5 100644
--- a/app/websocket/src/main/kotlin/com/xorker/draw/websocket/message/response/MafiaPhaseMessengerImpl.kt
+++ b/app/websocket/src/main/kotlin/com/xorker/draw/websocket/message/response/MafiaPhaseMessengerImpl.kt
@@ -11,18 +11,18 @@ import com.xorker.draw.websocket.SessionMessage
 import com.xorker.draw.websocket.broker.WebSocketBroadcaster
 import com.xorker.draw.websocket.message.response.dto.MafiaGameInfoBody
 import com.xorker.draw.websocket.message.response.dto.MafiaGameInfoMessage
-import com.xorker.draw.websocket.message.response.dto.MafiaPhaseEndBody
-import com.xorker.draw.websocket.message.response.dto.MafiaPhaseEndMessage
-import com.xorker.draw.websocket.message.response.dto.MafiaPhaseInferAnswerBody
-import com.xorker.draw.websocket.message.response.dto.MafiaPhaseInferAnswerMessage
-import com.xorker.draw.websocket.message.response.dto.MafiaPhasePlayingBody
-import com.xorker.draw.websocket.message.response.dto.MafiaPhasePlayingMessage
-import com.xorker.draw.websocket.message.response.dto.MafiaPhaseReadyBody
-import com.xorker.draw.websocket.message.response.dto.MafiaPhaseReadyMessage
-import com.xorker.draw.websocket.message.response.dto.MafiaPhaseVoteBody
-import com.xorker.draw.websocket.message.response.dto.MafiaPhaseVoteMessage
-import com.xorker.draw.websocket.message.response.dto.MafiaPhaseWaitBody
-import com.xorker.draw.websocket.message.response.dto.MafiaPhaseWaitMessage
+import com.xorker.draw.websocket.message.response.dto.phase.MafiaPhaseEndBody
+import com.xorker.draw.websocket.message.response.dto.phase.MafiaPhaseEndMessage
+import com.xorker.draw.websocket.message.response.dto.phase.MafiaPhaseInferAnswerBody
+import com.xorker.draw.websocket.message.response.dto.phase.MafiaPhaseInferAnswerMessage
+import com.xorker.draw.websocket.message.response.dto.phase.MafiaPhasePlayingBody
+import com.xorker.draw.websocket.message.response.dto.phase.MafiaPhasePlayingMessage
+import com.xorker.draw.websocket.message.response.dto.phase.MafiaPhaseReadyBody
+import com.xorker.draw.websocket.message.response.dto.phase.MafiaPhaseReadyMessage
+import com.xorker.draw.websocket.message.response.dto.phase.MafiaPhaseVoteBody
+import com.xorker.draw.websocket.message.response.dto.phase.MafiaPhaseVoteMessage
+import com.xorker.draw.websocket.message.response.dto.phase.MafiaPhaseWaitBody
+import com.xorker.draw.websocket.message.response.dto.phase.MafiaPhaseWaitMessage
 import com.xorker.draw.websocket.message.response.dto.toResponse
 import java.time.LocalDateTime
 import org.springframework.stereotype.Component
diff --git a/core/src/main/kotlin/com/xorker/draw/mafia/phase/MafiaPhasePlayGameProcessor.kt b/core/src/main/kotlin/com/xorker/draw/mafia/phase/MafiaPhasePlayGameProcessor.kt
index 8ca590e0..3b4472af 100644
--- a/core/src/main/kotlin/com/xorker/draw/mafia/phase/MafiaPhasePlayGameProcessor.kt
+++ b/core/src/main/kotlin/com/xorker/draw/mafia/phase/MafiaPhasePlayGameProcessor.kt
@@ -37,7 +37,8 @@ internal class MafiaPhasePlayGameProcessor(
 
         val gameOption = gameInfo.gameOption
 
-        val nextTurn = phase.nextTurn(gameOption.round, gameOption.turnCount)
+        val room = gameInfo.room
+        val nextTurn = phase.nextTurn(gameOption.round - 1, room.size() - 1)
 
         if (nextTurn == null) {
             nextStep.invoke()
diff --git a/core/src/main/kotlin/com/xorker/draw/mafia/phase/MafiaPhasePlayVoteProcessor.kt b/core/src/main/kotlin/com/xorker/draw/mafia/phase/MafiaPhasePlayVoteProcessor.kt
index e05298de..2ecf4c00 100644
--- a/core/src/main/kotlin/com/xorker/draw/mafia/phase/MafiaPhasePlayVoteProcessor.kt
+++ b/core/src/main/kotlin/com/xorker/draw/mafia/phase/MafiaPhasePlayVoteProcessor.kt
@@ -43,6 +43,7 @@ internal class MafiaPhasePlayVoteProcessor(
 
             if (candidate.first == mafiaPlayer.userId) {
                 winStep.invoke()
+                return
             }
         }
         loseStep.invoke()
diff --git a/core/src/main/kotlin/com/xorker/draw/mafia/phase/MafiaPhaseService.kt b/core/src/main/kotlin/com/xorker/draw/mafia/phase/MafiaPhaseService.kt
index ad9d97f4..ce94bbfb 100644
--- a/core/src/main/kotlin/com/xorker/draw/mafia/phase/MafiaPhaseService.kt
+++ b/core/src/main/kotlin/com/xorker/draw/mafia/phase/MafiaPhaseService.kt
@@ -5,6 +5,7 @@ import com.xorker.draw.mafia.MafiaGameInfo
 import com.xorker.draw.mafia.MafiaGameRepository
 import com.xorker.draw.mafia.MafiaPhase
 import com.xorker.draw.mafia.MafiaPhaseMessenger
+import com.xorker.draw.mafia.assert
 import com.xorker.draw.mafia.assertIs
 import com.xorker.draw.room.RoomId
 import org.springframework.stereotype.Service
@@ -94,7 +95,7 @@ internal class MafiaPhaseService(
 
         val phase = synchronized(gameInfo) {
             val votePhase = gameInfo.phase
-            assertIs<MafiaPhase.Vote>(votePhase)
+            assert<MafiaPhase.Vote, MafiaPhase.InferAnswer>(votePhase)
             mafiaPhaseEndGameProcessor.endGame(gameInfo)
         }
 
diff --git a/domain/src/main/kotlin/com/xorker/draw/mafia/MafiaGameOption.kt b/domain/src/main/kotlin/com/xorker/draw/mafia/MafiaGameOption.kt
index 34632422..02a54a7b 100644
--- a/domain/src/main/kotlin/com/xorker/draw/mafia/MafiaGameOption.kt
+++ b/domain/src/main/kotlin/com/xorker/draw/mafia/MafiaGameOption.kt
@@ -10,6 +10,6 @@ data class MafiaGameOption(
     val round: Int = 2, // 전체 라운드 수
     val turnTime: Duration = Duration.ofSeconds(5), // 턴 당 최대 시간
     val turnCount: Int = 2, // 턴 당 최대 획 수
-    val voteTime: Duration = Duration.ofMinutes(10), // 투표 시간
-    val answerTime: Duration = Duration.ofMinutes(10), // 정답 입력 시간
+    val voteTime: Duration = Duration.ofSeconds(10), // 투표 시간
+    val answerTime: Duration = Duration.ofSeconds(10), // 정답 입력 시간
 )
diff --git a/domain/src/main/kotlin/com/xorker/draw/mafia/MafiaPhase.kt b/domain/src/main/kotlin/com/xorker/draw/mafia/MafiaPhase.kt
index 8283e1bc..efd13178 100644
--- a/domain/src/main/kotlin/com/xorker/draw/mafia/MafiaPhase.kt
+++ b/domain/src/main/kotlin/com/xorker/draw/mafia/MafiaPhase.kt
@@ -147,3 +147,14 @@ inline fun <reified T : MafiaPhase> assertIs(phase: MafiaPhase) {
         throw InvalidMafiaPhaseException("유효하지 않는 Phase 입니다. 기대값: ${T::class}, 요청값: $phase")
     }
 }
+
+@OptIn(ExperimentalContracts::class)
+inline fun <reified T1 : MafiaPhase, reified T2 : MafiaPhase> assert(phase: MafiaPhase) {
+    contract {
+        returns() implies (phase is T1 || phase is T2)
+    }
+
+    if (phase !is T1 && phase !is T2) {
+        throw InvalidMafiaPhaseException("유효하지 않는 Phase 입니다. 기대값: ${T1::class} or ${T2::class}, 요청값: $phase")
+    }
+}