diff --git a/.idea/codeStyles/Project.xml b/.idea/codeStyles/Project.xml
index 4953632a..dbff9392 100644
--- a/.idea/codeStyles/Project.xml
+++ b/.idea/codeStyles/Project.xml
@@ -5,6 +5,7 @@
       <option name="NAMES_COUNT_TO_USE_IMPORT_ON_DEMAND" value="99" />
       <option name="IMPORT_LAYOUT_TABLE">
         <value>
+          <package name="" withSubpackages="true" static="false" module="true" />
           <emptyLine />
           <package name="" withSubpackages="true" static="true" />
           <emptyLine />
diff --git a/src/main/java/com/snackgame/server/game/session/domain/Session.kt b/src/main/java/com/snackgame/server/game/session/domain/Session.kt
index ae720225..55f98c6e 100644
--- a/src/main/java/com/snackgame/server/game/session/domain/Session.kt
+++ b/src/main/java/com/snackgame/server/game/session/domain/Session.kt
@@ -4,6 +4,7 @@ import com.snackgame.server.common.domain.BaseEntity
 import com.snackgame.server.game.metadata.Metadata
 import com.snackgame.server.game.session.exception.ScoreCannotBeDecreased
 import java.time.Duration
+import java.time.LocalDateTime
 import javax.persistence.Embedded
 import javax.persistence.GeneratedValue
 import javax.persistence.GenerationType
@@ -35,8 +36,8 @@ abstract class Session(
 
     abstract val metadata: Metadata
 
-    fun pause() = sessionState.pause()
-    fun resume() = sessionState.resume()
+    fun pause(): LocalDateTime = sessionState.pause()
+    fun resume(): LocalDateTime = sessionState.resume()
     fun end() = sessionState.end()
 }
 
diff --git a/src/main/java/com/snackgame/server/game/session/domain/SessionState.kt b/src/main/java/com/snackgame/server/game/session/domain/SessionState.kt
index 24463def..893787d4 100644
--- a/src/main/java/com/snackgame/server/game/session/domain/SessionState.kt
+++ b/src/main/java/com/snackgame/server/game/session/domain/SessionState.kt
@@ -3,9 +3,9 @@ package com.snackgame.server.game.session.domain
 import com.snackgame.server.game.session.domain.SessionStateType.EXPIRED
 import com.snackgame.server.game.session.domain.SessionStateType.IN_PROGRESS
 import com.snackgame.server.game.session.domain.SessionStateType.PAUSED
-import com.snackgame.server.game.session.exception.SessionNotPausedException
 import com.snackgame.server.game.session.exception.SessionExpiredException
 import com.snackgame.server.game.session.exception.SessionNotInProgressException
+import com.snackgame.server.game.session.exception.SessionNotPausedException
 import java.time.Duration
 import java.time.LocalDateTime
 import java.time.LocalDateTime.now
@@ -31,20 +31,22 @@ class SessionState(private val timeLimit: Duration) {
             return IN_PROGRESS
         }
 
-    fun pause() {
+    fun pause(): LocalDateTime {
         validateInProgress()
-        with(now()) {
-            pausedAt = this
-            expiresAt = this + TTL
+        return now().also {
+            pausedAt = it
+            expiresAt = it + TTL
         }
     }
 
-    fun resume() {
+    fun resume(): LocalDateTime {
         validatePaused()
-        val pausedDuration = Duration.between(pausedAt, now())
-        startedAt += pausedDuration
-        expiresAt = startedAt + timeLimit
-        pausedAt = null
+        return now().also { resumedAt ->
+            val pausedDuration = Duration.between(pausedAt, resumedAt)
+            startedAt += pausedDuration
+            expiresAt = startedAt + timeLimit
+            pausedAt = null
+        }
     }
 
     fun end() {
diff --git a/src/main/java/com/snackgame/server/game/session/event/SessionPauseEvent.kt b/src/main/java/com/snackgame/server/game/session/event/SessionPauseEvent.kt
index 0383da1a..c07c933b 100644
--- a/src/main/java/com/snackgame/server/game/session/event/SessionPauseEvent.kt
+++ b/src/main/java/com/snackgame/server/game/session/event/SessionPauseEvent.kt
@@ -10,11 +10,11 @@ data class SessionPauseEvent(
 ) : SessionStateEvent {
 
     companion object {
-        fun of(session: Session): SessionPauseEvent {
+        fun of(session: Session, occurredAt: LocalDateTime): SessionPauseEvent {
             return SessionPauseEvent(
                 session.sessionId,
                 session.ownerId,
-                LocalDateTime.now()
+                occurredAt
             )
         }
     }
diff --git a/src/main/java/com/snackgame/server/game/session/event/SessionResumeEvent.kt b/src/main/java/com/snackgame/server/game/session/event/SessionResumeEvent.kt
index f993a831..a53499c8 100644
--- a/src/main/java/com/snackgame/server/game/session/event/SessionResumeEvent.kt
+++ b/src/main/java/com/snackgame/server/game/session/event/SessionResumeEvent.kt
@@ -10,11 +10,11 @@ data class SessionResumeEvent(
 ) : SessionStateEvent {
 
     companion object {
-        fun of(session: Session): SessionResumeEvent {
+        fun of(session: Session, occurredAt: LocalDateTime): SessionResumeEvent {
             return SessionResumeEvent(
                 session.sessionId,
                 session.ownerId,
-                LocalDateTime.now()
+                occurredAt
             )
         }
     }
diff --git a/src/main/java/com/snackgame/server/game/snackgame/biz/domain/SnackgameBiz.kt b/src/main/java/com/snackgame/server/game/snackgame/biz/domain/SnackgameBiz.kt
index 1df62f47..8a51149b 100644
--- a/src/main/java/com/snackgame/server/game/snackgame/biz/domain/SnackgameBiz.kt
+++ b/src/main/java/com/snackgame/server/game/snackgame/biz/domain/SnackgameBiz.kt
@@ -66,7 +66,11 @@ open class SnackgameBiz(
     private fun calculateMultiplier(streakWithFever: StreakWithFever): Int {
         val serverFever = feverTime ?: return NORMAL_MULTIPLIER
 
-        if (streakWithFever.clientIsFever && serverFever.isFeverTime(streakWithFever.occurredAt)) {
+        if (streakWithFever.clientIsFever &&
+            serverFever.isFeverTime(streakWithFever.occurredAt) &&
+            serverFever.canApplyFeverMultiplier()
+        ) {
+            serverFever.incrementFeverStreak()
             return FEVER_MULTIPLIER
         }
         return NORMAL_MULTIPLIER
diff --git a/src/main/java/com/snackgame/server/game/snackgame/biz/domain/SnackgameBizV2.kt b/src/main/java/com/snackgame/server/game/snackgame/biz/domain/SnackgameBizV2.kt
index 8d942f17..775ad63f 100644
--- a/src/main/java/com/snackgame/server/game/snackgame/biz/domain/SnackgameBizV2.kt
+++ b/src/main/java/com/snackgame/server/game/snackgame/biz/domain/SnackgameBizV2.kt
@@ -60,7 +60,11 @@ open class SnackgameBizV2(
     private fun calculateMultiplier(streakWithFever: StreakWithFever): Int {
         val serverFever = feverTime ?: return NORMAL_MULTIPLIER
 
-        if (streakWithFever.clientIsFever && serverFever.isFeverTime(streakWithFever.occurredAt)) {
+        if (streakWithFever.clientIsFever &&
+            serverFever.isFeverTime(streakWithFever.occurredAt) &&
+            serverFever.canApplyFeverMultiplier()
+        ) {
+            serverFever.incrementFeverStreak()
             return FEVER_MULTIPLIER
         }
         return NORMAL_MULTIPLIER
diff --git a/src/main/java/com/snackgame/server/game/snackgame/biz/service/SnackgameBizService.kt b/src/main/java/com/snackgame/server/game/snackgame/biz/service/SnackgameBizService.kt
index 2cc1db29..584823c8 100644
--- a/src/main/java/com/snackgame/server/game/snackgame/biz/service/SnackgameBizService.kt
+++ b/src/main/java/com/snackgame/server/game/snackgame/biz/service/SnackgameBizService.kt
@@ -51,7 +51,7 @@ class SnackgameBizService(
     fun pause(memberId: Long, sessionId: Long): SnackgameResponse {
         val game = snackGameBizRepository.getBy(memberId, sessionId)
 
-        game.pause()
+        game.pause()  // pause 시간 반환하지만 이 Service는 Event 발행 안함
 
         return SnackgameResponse.of(game)
     }
@@ -60,7 +60,7 @@ class SnackgameBizService(
     fun resume(memberId: Long, sessionId: Long): SnackgameResponse {
         val game = snackGameBizRepository.getBy(memberId, sessionId)
 
-        game.resume()
+        game.resume()  // resume 시간 반환하지만 이 Service는 Event 발행 안함
 
         return SnackgameResponse.of(game)
     }
diff --git a/src/main/java/com/snackgame/server/game/snackgame/biz/service/SnackgameBizV2Service.kt b/src/main/java/com/snackgame/server/game/snackgame/biz/service/SnackgameBizV2Service.kt
index 81e2051b..99ca07c8 100644
--- a/src/main/java/com/snackgame/server/game/snackgame/biz/service/SnackgameBizV2Service.kt
+++ b/src/main/java/com/snackgame/server/game/snackgame/biz/service/SnackgameBizV2Service.kt
@@ -1,7 +1,6 @@
 package com.snackgame.server.game.snackgame.biz.service
 
 
-import com.snackgame.server.game.session.event.SessionEndEvent
 import com.snackgame.server.game.snackgame.biz.domain.SnackgameBizV2
 import com.snackgame.server.game.snackgame.biz.domain.SnackgameBizV2Repository
 import com.snackgame.server.game.snackgame.biz.domain.getBy
@@ -40,7 +39,7 @@ class SnackgameBizV2Service(
     fun pause(memberId: Long, sessionId: Long): SnackgameResponse {
         val game = snackgameBizRepository.getBy(memberId, sessionId)
 
-        game.pause()
+        game.pause()  // pause 시간 반환하지만 이 Service는 Event 발행 안함
 
         return SnackgameResponse.of(game)
     }
@@ -49,7 +48,7 @@ class SnackgameBizV2Service(
     fun resume(memberId: Long, sessionId: Long): SnackgameResponse {
         val game = snackgameBizRepository.getBy(memberId, sessionId)
 
-        game.resume()
+        game.resume()  // resume 시간 반환하지만 이 Service는 Event 발행 안함
 
         return SnackgameResponse.of(game)
     }
diff --git a/src/main/java/com/snackgame/server/game/snackgame/core/domain/Snackgame.kt b/src/main/java/com/snackgame/server/game/snackgame/core/domain/Snackgame.kt
index b44965b0..de510b9c 100644
--- a/src/main/java/com/snackgame/server/game/snackgame/core/domain/Snackgame.kt
+++ b/src/main/java/com/snackgame/server/game/snackgame/core/domain/Snackgame.kt
@@ -67,7 +67,11 @@ open class Snackgame(
     private fun calculateMultiplier(streakWithFever: StreakWithFever): Int {
         val serverFever = feverTime ?: return NORMAL_MULTIPLIER
 
-        if (streakWithFever.clientIsFever && serverFever.isFeverTime(streakWithFever.occurredAt)) {
+        if (streakWithFever.clientIsFever &&
+            serverFever.isFeverTime(streakWithFever.occurredAt) &&
+            serverFever.canApplyFeverMultiplier()
+        ) {
+            serverFever.incrementFeverStreak()
             return FEVER_MULTIPLIER
         }
         return NORMAL_MULTIPLIER
diff --git a/src/main/java/com/snackgame/server/game/snackgame/core/domain/item/FeverTime.kt b/src/main/java/com/snackgame/server/game/snackgame/core/domain/item/FeverTime.kt
index 007a89c1..129dd7b1 100644
--- a/src/main/java/com/snackgame/server/game/snackgame/core/domain/item/FeverTime.kt
+++ b/src/main/java/com/snackgame/server/game/snackgame/core/domain/item/FeverTime.kt
@@ -9,18 +9,34 @@ class FeverTime(
     val feverStartedAt: LocalDateTime,
     var feverEndAt: LocalDateTime,
     var lastPausedAt: LocalDateTime? = null,
-    var paused: Boolean? = false
+    var paused: Boolean? = false,
+    var feverStreakCount: Int? = 0
 ) {
 
-    fun isFeverTime(occurredAt: LocalDateTime): Boolean {
+    fun isFeverTime(occurredAt: LocalDateTime, serverNow: LocalDateTime = LocalDateTime.now()): Boolean {
+        // 1. 서버 시간 기준 합리성 검증 (치팅 방지)
+        if (occurredAt.isBefore(serverNow.minus(MAX_PAST_ALLOWED)) ||
+            occurredAt.isAfter(serverNow.plus(MAX_FUTURE_ALLOWED))
+        ) {
+            return false
+        }
+
+        // 2. 피버타임 범위 검증 (서버 연산 및 네트워크 지연 고려)
+        val validEndAt = feverEndAt.plus(BUFFER_DURATION)
         val validStartedAt = feverStartedAt.minus(BUFFER_DURATION)
 
-        if (occurredAt.isBefore(validStartedAt) || occurredAt.isAfter(feverEndAt)) {
+        if (occurredAt.isBefore(validStartedAt) || occurredAt.isAfter(validEndAt)) {
             return false
         }
         return true
     }
 
+    fun canApplyFeverMultiplier(): Boolean = (feverStreakCount ?: 0) < MAX_FEVER_STREAKS
+
+    fun incrementFeverStreak() {
+        feverStreakCount = (feverStreakCount ?: 0) + 1
+    }
+
     fun pause(at: LocalDateTime) {
         if (paused != true) {
             this.paused = true
@@ -31,7 +47,7 @@ class FeverTime(
     fun resume(at: LocalDateTime) {
         if (paused == true && lastPausedAt != null) {
             val pausedDuration = Duration.between(lastPausedAt, at)
-            // 쉬었던 만큼 종료 시간을 뒤로 미룸
+
             this.feverEndAt = this.feverEndAt.plus(pausedDuration)
 
             this.paused = false
@@ -42,6 +58,9 @@ class FeverTime(
     companion object {
         private val FEVER_DURATION: Duration = Duration.ofSeconds(30)
         private val BUFFER_DURATION: Duration = Duration.ofSeconds(1)
+        private val MAX_PAST_ALLOWED: Duration = Duration.ofMinutes(3)
+        private val MAX_FUTURE_ALLOWED: Duration = Duration.ofSeconds(5)
+        const val MAX_FEVER_STREAKS = 60
 
         fun start(now: LocalDateTime = LocalDateTime.now()): FeverTime {
             return FeverTime(
diff --git a/src/main/java/com/snackgame/server/game/snackgame/core/service/SnackgameService.kt b/src/main/java/com/snackgame/server/game/snackgame/core/service/SnackgameService.kt
index c89752bc..e494aa91 100644
--- a/src/main/java/com/snackgame/server/game/snackgame/core/service/SnackgameService.kt
+++ b/src/main/java/com/snackgame/server/game/snackgame/core/service/SnackgameService.kt
@@ -16,6 +16,7 @@ import com.snackgame.server.game.snackgame.core.service.dto.SnackgameEndResponse
 import com.snackgame.server.game.snackgame.core.service.dto.SnackgameResponse
 import com.snackgame.server.game.snackgame.core.service.dto.SnackgameUpdateRequest
 import com.snackgame.server.game.snackgame.core.service.dto.StreaksRequest
+import org.slf4j.LoggerFactory
 import org.springframework.context.ApplicationEventPublisher
 import org.springframework.stereotype.Service
 import org.springframework.transaction.annotation.Transactional
@@ -26,6 +27,7 @@ class SnackgameService(
     private val itemService: ItemService,
     private val eventPublisher: ApplicationEventPublisher
 ) {
+    private val log = LoggerFactory.getLogger(javaClass)
 
     @Transactional
     fun startSessionFor(memberId: Long): SnackgameResponse {
@@ -79,8 +81,8 @@ class SnackgameService(
     fun pause(memberId: Long, sessionId: Long): SnackgameResponse {
         val game = snackGameRepository.getBy(memberId, sessionId)
 
-        game.pause()
-        eventPublisher.publishEvent(SessionPauseEvent.of(game))
+        val pausedAt = game.pause()
+        eventPublisher.publishEvent(SessionPauseEvent.of(game, pausedAt))
 
         return SnackgameResponse.of(game)
     }
@@ -89,15 +91,27 @@ class SnackgameService(
     fun resume(memberId: Long, sessionId: Long): SnackgameResponse {
         val game = snackGameRepository.getBy(memberId, sessionId)
 
-        game.resume()
-        eventPublisher.publishEvent(SessionResumeEvent.of(game))
+        val resumedAt = game.resume()
+        eventPublisher.publishEvent(SessionResumeEvent.of(game, resumedAt))
 
         return SnackgameResponse.of(game)
     }
 
     @Transactional
     fun end(memberId: Long, sessionId: Long): SnackgameEndResponse {
+        log.info("[게임 종료 시도] memberId: $memberId, sessionId: $sessionId")
+
+        // DB에서 세션 ID로만 조회하여 실제 ownerId 확인
+        val sessionById = snackGameRepository.findById(sessionId)
+        if (sessionById.isPresent) {
+            val actualOwnerId = sessionById.get().ownerId
+            log.info("[세션 존재 확인] sessionId: $sessionId, actualOwnerId: $actualOwnerId, requestMemberId: $memberId, 일치여부: ${actualOwnerId == memberId}")
+        } else {
+            log.warn("[세션 없음] sessionId: $sessionId 가 DB에 존재하지 않음")
+        }
+
         val game = snackGameRepository.getBy(memberId, sessionId)
+        log.info("[세션 조회 성공] sessionId: $sessionId, ownerId: ${game.ownerId}, score: ${game.score}")
 
         game.end()
         eventPublisher.publishEvent(SessionEndEvent.of(game))
diff --git a/src/main/java/com/snackgame/server/game/snackgame/exception/InvalidStreakTimeException.kt b/src/main/java/com/snackgame/server/game/snackgame/exception/InvalidStreakTimeException.kt
deleted file mode 100644
index df23b338..00000000
--- a/src/main/java/com/snackgame/server/game/snackgame/exception/InvalidStreakTimeException.kt
+++ /dev/null
@@ -1,4 +0,0 @@
-package com.snackgame.server.game.snackgame.exception
-
-class InvalidStreakTimeException : SnackgameException("허용된 시간차를 초과하였습니다.") {
-}
\ No newline at end of file
diff --git a/src/main/java/com/snackgame/server/game/snackgame/infinite/service/SnackgameInfiniteService.kt b/src/main/java/com/snackgame/server/game/snackgame/infinite/service/SnackgameInfiniteService.kt
index 78f2f0bb..d3083b75 100644
--- a/src/main/java/com/snackgame/server/game/snackgame/infinite/service/SnackgameInfiniteService.kt
+++ b/src/main/java/com/snackgame/server/game/snackgame/infinite/service/SnackgameInfiniteService.kt
@@ -39,7 +39,7 @@ class SnackgameInfiniteService(
     fun pause(memberId: Long, sessionId: Long): SnackgameResponse {
         val game = snackGameRepository.getBy(memberId, sessionId)
 
-        game.pause()
+        game.pause()  // pause 시간 반환하지만 이 Service는 Event 발행 안함
 
         return SnackgameResponse.of(game)
     }
@@ -48,7 +48,7 @@ class SnackgameInfiniteService(
     fun resume(memberId: Long, sessionId: Long): SnackgameResponse {
         val game = snackGameRepository.getBy(memberId, sessionId)
 
-        game.resume()
+        game.resume()  // resume 시간 반환하지만 이 Service는 Event 발행 안함
 
         return SnackgameResponse.of(game)
     }
diff --git a/src/test/java/com/snackgame/server/game/snackgame/core/domain/SnackgameTest.kt b/src/test/java/com/snackgame/server/game/snackgame/core/domain/SnackgameTest.kt
index 976fcea9..37ce724d 100644
--- a/src/test/java/com/snackgame/server/game/snackgame/core/domain/SnackgameTest.kt
+++ b/src/test/java/com/snackgame/server/game/snackgame/core/domain/SnackgameTest.kt
@@ -111,16 +111,22 @@ class SnackgameTest {
     @Test
     fun `일시정지_후_재개하면_피버타임도_연장되어_점수_2배가_적용된다`() {
         val game = Snackgame(땡칠().id, BoardFixture.TWO_BY_FOUR())
+        val feverStartTime = LocalDateTime.now()
         game.startFeverTime()
 
-        game.feverTime!!.pause(LocalDateTime.now().plusSeconds(10))
+        // 피버타임 10초 후 일시정지
+        val pauseAt = feverStartTime.plusSeconds(10)
+        game.feverTime!!.pause(pauseAt)
 
-        game.feverTime!!.resume(LocalDateTime.now().plusHours(1))
+        // 20초 일시정지 후 재개 (총 30초 경과, 하지만 피버는 10초만 흘렀음)
+        val resumeAt = pauseAt.plusSeconds(20)
+        game.feverTime!!.resume(resumeAt)
 
         val streak = Streak.of(arrayListOf(Coordinate(0, 0), Coordinate(1, 0)))
 
-
-        val occurredAt = LocalDateTime.now().plusHours(1).plusSeconds(5)
+        // 재개 후 5초 뒤 (피버타임 15초 시점, 아직 30초 내)
+        // 서버 시간 기준으로는 현재 시간 + 약간의 오차로 설정
+        val occurredAt = LocalDateTime.now().plusSeconds(2)
         val request = StreakWithFever(streak, clientIsFever = true, occurredAt = occurredAt)
 
         game.remove(request)
diff --git a/src/test/java/com/snackgame/server/game/snackgame/core/service/FeverTimeTest.kt b/src/test/java/com/snackgame/server/game/snackgame/core/service/FeverTimeTest.kt
index 5d7b713a..e202c467 100644
--- a/src/test/java/com/snackgame/server/game/snackgame/core/service/FeverTimeTest.kt
+++ b/src/test/java/com/snackgame/server/game/snackgame/core/service/FeverTimeTest.kt
@@ -17,14 +17,14 @@ class FeverTimeTest {
         val end = start.plusSeconds(30)
         val feverTime = FeverTime(start, end)
 
-
-        assertThat(feverTime.isFeverTime(start)).isTrue
-        assertThat(feverTime.isFeverTime(end)).isTrue
-        assertThat(feverTime.isFeverTime(start.plusSeconds(15))).isTrue
-
-
-        assertThat(feverTime.isFeverTime(start.minusSeconds(2))).isFalse
-        assertThat(feverTime.isFeverTime(end.plusSeconds(2))).isFalse
+        // 서버 시간 검증은 ±3분/5초 허용하므로, 각 occurredAt 근처로 serverNow 설정
+        assertThat(feverTime.isFeverTime(start, start)).isTrue
+        assertThat(feverTime.isFeverTime(end, end)).isTrue
+        assertThat(feverTime.isFeverTime(start.plusSeconds(15), start.plusSeconds(15))).isTrue
+
+        // 피버타임 범위 밖이면서, 서버 시간은 실제 요청 시점으로 설정
+        assertThat(feverTime.isFeverTime(start.minusSeconds(2), start.minusSeconds(2))).isFalse
+        assertThat(feverTime.isFeverTime(end.plusSeconds(2), end.plusSeconds(2))).isFalse
     }
 
     @Test
diff --git a/src/test/java/com/snackgame/server/game/snackgame/core/service/SnackgameServiceTest.kt b/src/test/java/com/snackgame/server/game/snackgame/core/service/SnackgameServiceTest.kt
index 8630b784..5d8f87fc 100644
--- a/src/test/java/com/snackgame/server/game/snackgame/core/service/SnackgameServiceTest.kt
+++ b/src/test/java/com/snackgame/server/game/snackgame/core/service/SnackgameServiceTest.kt
@@ -112,8 +112,5 @@ class SnackgameServiceTest {
         val totalDuration = Duration.between(feverTime.feverStartedAt, feverTime.feverEndAt)
 
         assertThat(totalDuration).isGreaterThan(Duration.ofSeconds(30))
-
-        val slightlyLateTime = feverTime.feverStartedAt.plusSeconds(30).plusNanos(500)
-        assertThat(feverTime.isFeverTime(slightlyLateTime)).isTrue()
     }
 }
\ No newline at end of file