diff --git a/src/main/java/com/foru/freebe/errors/errorcode/ScheduleErrorCode.java b/src/main/java/com/foru/freebe/errors/errorcode/ScheduleErrorCode.java
index 138a3ce..4cdfac2 100644
--- a/src/main/java/com/foru/freebe/errors/errorcode/ScheduleErrorCode.java
+++ b/src/main/java/com/foru/freebe/errors/errorcode/ScheduleErrorCode.java
@@ -7,7 +7,9 @@
 @RequiredArgsConstructor
 public enum ScheduleErrorCode implements ErrorCode {
 
-    START_TIME_AFTER_END_TIME(400, "시작시간이 종료시간보다 더 늦습니다.");
+    START_TIME_AFTER_END_TIME(400, "시작시간과 종료시간이 올바르지 않습니다."),
+    CANNOT_CHANGE_SAME_SCHEDULE_UNIT(400, "같은 스케줄 단위로는 변경할 수 없습니다.");
+
 
     private final int httpStatus;
     private final String message;
diff --git a/src/main/java/com/foru/freebe/schedule/entity/BaseSchedule.java b/src/main/java/com/foru/freebe/schedule/entity/BaseSchedule.java
index 43819eb..5dec707 100644
--- a/src/main/java/com/foru/freebe/schedule/entity/BaseSchedule.java
+++ b/src/main/java/com/foru/freebe/schedule/entity/BaseSchedule.java
@@ -61,6 +61,12 @@ public void updateScheduleTime(LocalTime startTime, LocalTime endTime, Operation
         this.operationStatus = operationStatus;
     }
 
+    public void initializeSchedule() {
+        this.startTime = LocalTime.of(9,0,0);
+        this.endTime = LocalTime.of(18,0,0);
+        this.operationStatus = OperationStatus.ACTIVE;
+    }
+
     @Builder
     public BaseSchedule(Member photographer, DayOfWeek dayOfWeek, LocalTime startTime, LocalTime endTime,
         OperationStatus operationStatus) {
diff --git a/src/main/java/com/foru/freebe/schedule/service/BaseScheduleService.java b/src/main/java/com/foru/freebe/schedule/service/BaseScheduleService.java
index 54a5956..a6ecec0 100644
--- a/src/main/java/com/foru/freebe/schedule/service/BaseScheduleService.java
+++ b/src/main/java/com/foru/freebe/schedule/service/BaseScheduleService.java
@@ -91,6 +91,16 @@ public ScheduleUnitDto getScheduleUnit(Long photographerId) {
     @Transactional
     public void updateScheduleUnit(Long photographerId, ScheduleUnitDto scheduleUnitDto) {
         Member photographer = getMember(photographerId);
+
+        if (photographer.getScheduleUnit() == scheduleUnitDto.getScheduleUnit()) {
+            throw new RestApiException(ScheduleErrorCode.CANNOT_CHANGE_SAME_SCHEDULE_UNIT);
+        }
+
+        List<BaseSchedule> baseScheduleList = baseScheduleRepository.findByPhotographerId(photographer.getId());
+        for (BaseSchedule baseSchedule : baseScheduleList) {
+            baseSchedule.initializeSchedule();
+        }
+
         photographer.updateScheduleUnit(scheduleUnitDto.getScheduleUnit());
     }