diff --git a/src/main/kotlin/kr/co/vividnext/sodalive/content/main/tab/series/AudioContentMainTabSeriesController.kt b/src/main/kotlin/kr/co/vividnext/sodalive/content/main/tab/series/AudioContentMainTabSeriesController.kt
index e9577a0..df62807 100644
--- a/src/main/kotlin/kr/co/vividnext/sodalive/content/main/tab/series/AudioContentMainTabSeriesController.kt
+++ b/src/main/kotlin/kr/co/vividnext/sodalive/content/main/tab/series/AudioContentMainTabSeriesController.kt
@@ -39,15 +39,15 @@ class AudioContentMainTabSeriesController(private val service: AudioContentMainT
         )
     }
 
-    @GetMapping("/completed-monthly-rank")
-    fun getRankMonthlyCompletedSeriesList(
+    @GetMapping("/completed-rank")
+    fun getRank10DaysCompletedSeriesList(
         @AuthenticationPrincipal(expression = "#this == 'anonymousUser' ? null : member") member: Member?,
         pageable: Pageable
     ) = run {
         if (member == null) throw SodaException("로그인 정보를 확인해주세요.")
 
         ApiResponse.ok(
-            service.getRankMonthlyCompletedSeriesList(
+            service.getRank10DaysCompletedSeriesList(
                 memberId = member.id!!,
                 isAdult = member.auth != null,
                 offset = pageable.offset,
diff --git a/src/main/kotlin/kr/co/vividnext/sodalive/content/main/tab/series/AudioContentMainTabSeriesService.kt b/src/main/kotlin/kr/co/vividnext/sodalive/content/main/tab/series/AudioContentMainTabSeriesService.kt
index 44d256f..58ade63 100644
--- a/src/main/kotlin/kr/co/vividnext/sodalive/content/main/tab/series/AudioContentMainTabSeriesService.kt
+++ b/src/main/kotlin/kr/co/vividnext/sodalive/content/main/tab/series/AudioContentMainTabSeriesService.kt
@@ -10,7 +10,9 @@ import kr.co.vividnext.sodalive.member.Member
 import kr.co.vividnext.sodalive.rank.RankingService
 import org.springframework.stereotype.Service
 import java.time.DayOfWeek
+import java.time.LocalDate
 import java.time.LocalDateTime
+import java.time.YearMonth
 import java.time.temporal.TemporalAdjusters
 
 @Service
@@ -168,20 +170,13 @@ class AudioContentMainTabSeriesService(
         return GetSeriesListResponse(totalCount, items)
     }
 
-    fun getRankMonthlyCompletedSeriesList(
+    fun getRank10DaysCompletedSeriesList(
         memberId: Long,
         isAdult: Boolean,
         offset: Long,
         limit: Long
     ): GetSeriesListResponse {
-        val monthlyRankingStartDate = LocalDateTime.now()
-            .withDayOfMonth(1)
-            .withHour(15)
-            .withMinute(0)
-            .withSecond(0)
-            .minusDays(1)
-        val monthlyRankingEndDate = monthlyRankingStartDate
-            .plusMonths(1)
+        val (startDate, endDate) = calculateStartAndEndDate()
 
         val totalCount = rankingService.getCompleteSeriesRankingTotalCount(
             memberId = memberId,
@@ -191,8 +186,8 @@ class AudioContentMainTabSeriesService(
         val items = rankingService.getCompleteSeriesRanking(
             memberId = memberId,
             isAdult = isAdult,
-            startDate = monthlyRankingStartDate,
-            endDate = monthlyRankingEndDate,
+            startDate = startDate,
+            endDate = endDate,
             offset = offset,
             limit = limit
         )
@@ -218,4 +213,30 @@ class AudioContentMainTabSeriesService(
             isAdult = isAdult
         )
     }
+
+    private fun calculateStartAndEndDate(today: LocalDate = LocalDate.now()): Pair<LocalDateTime, LocalDateTime> {
+        val yearMonth = YearMonth.from(today)
+        val lastDayOfMonth = yearMonth.lengthOfMonth()
+
+        return when (today.dayOfMonth) {
+            in 11..20 -> Pair(
+                today.withDayOfMonth(1).minusDays(1).atTime(15, 0),
+                today.withDayOfMonth(10).atTime(15, 0)
+            )
+
+            in 21..lastDayOfMonth -> Pair(
+                today.withDayOfMonth(10).atTime(15, 0),
+                today.withDayOfMonth(20).atTime(15, 0)
+            )
+
+            else -> {
+                val previousMonth = yearMonth.minusMonths(1)
+                val lastDayOfPreviousMonth = previousMonth.lengthOfMonth()
+                Pair(
+                    LocalDate.of(previousMonth.year, previousMonth.month, 20).atTime(15, 0),
+                    LocalDate.of(previousMonth.year, previousMonth.month, lastDayOfPreviousMonth).atTime(15, 0)
+                )
+            }
+        }
+    }
 }