diff --git a/hwe/sammo/API/General/Join.php b/hwe/sammo/API/General/Join.php
index b3eac283..a467c605 100644
--- a/hwe/sammo/API/General/Join.php
+++ b/hwe/sammo/API/General/Join.php
@@ -277,10 +277,11 @@ class Join extends \sammo\BaseAPI
 
         if ($inheritTurntime !== null) {
             //FIXME: 오동작함
-            $inheritTurntime = $inheritTurntime % ($gameStor->turnterm * 60);
+            $inheritTurntime = $inheritTurntime % ($admin['turnterm'] * 60);
             $inheritTurntime += Util::randRangeInt(0, 999999) / 1000000;
             $turntime = new \DateTimeImmutable(cutTurn($admin['turntime'], $admin['turnterm']));
-            $turntime = TimeUtil::format($turntime->add(TimeUtil::secondsToDateInterval($inheritTurntime)), true);
+            $turntime = $turntime->add(TimeUtil::secondsToDateInterval($inheritTurntime));
+            $turntime = TimeUtil::format($turntime, true);
         } else {
             $turntime = getRandTurn($admin['turnterm'], new \DateTimeImmutable($admin['turntime']));
         }
diff --git a/hwe/sammo/API/InheritAction/ResetTurnTime.php b/hwe/sammo/API/InheritAction/ResetTurnTime.php
index 6f19dc75..8cb2f692 100644
--- a/hwe/sammo/API/InheritAction/ResetTurnTime.php
+++ b/hwe/sammo/API/InheritAction/ResetTurnTime.php
@@ -54,13 +54,13 @@ class ResetTurnTime extends \sammo\BaseAPI
         $gameStor = new KVStorage($db, 'game_env');
         [$turnTerm, $serverTurnTime] = $gameStor->getValuesAsArray(['turnterm', 'turntime']);
 
+        $currTurnTime = new DateTimeImmutable($general->getTurnTime());
         $serverTurnTimeObj = new DateTimeImmutable($serverTurnTime);
-        $turnTime = new DateTimeImmutable($general->getTurnTime());
 
         $afterTurn = Util::randRange($turnTerm * -60 / 2, $turnTerm * 60 / 2);
 
-        $turnTime = $turnTime->add(TimeUtil::secondsToDateInterval($afterTurn));
-        if ($turnTime <= $serverTurnTimeObj) {
+        $turnTime = $currTurnTime->add(TimeUtil::secondsToDateInterval($afterTurn));
+        if ($turnTime <= $serverTurnTimeObj && $serverTurnTimeObj <= $currTurnTime) {
             $turnTime = $turnTime->add(TimeUtil::secondsToDateInterval($turnTerm * 60));
         }
 
diff --git a/hwe/ts/Join.vue b/hwe/ts/Join.vue
index b04d1863..e1c740d9 100644
--- a/hwe/ts/Join.vue
+++ b/hwe/ts/Join.vue
@@ -244,6 +244,7 @@
             :readonly="!inheritTurnTimeSet"
             :min="0"
             :max="1 - turnterm"
+            v-model="inheritTurnTimeMinute"
             title="분"
           />
         </div>
@@ -252,6 +253,7 @@
             :readonly="!inheritTurnTimeSet"
             :min="0"
             :max="60"
+            v-model="inheritTurnTimeSecond"
             title="초"
           />
         </div>
@@ -432,18 +434,21 @@ export default defineComponent({
     inheritTurnTimeMinute(newValue: number) {
       if (!this.inheritTurnTimeSet) {
         this.args.inheritTurntime = 0;
+        return;
       }
       this.args.inheritTurntime = newValue * 60 + this.inheritTurnTimeSecond;
     },
     inheritTurnTimeSecond(newValue: number) {
       if (!this.inheritTurnTimeSet) {
         this.args.inheritTurntime = 0;
+        return;
       }
       this.args.inheritTurntime = this.inheritTurnTimeMinute * 60 + newValue;
     },
     inheritTurnTimeSet(newValue: boolean) {
       if (!newValue) {
         this.args.inheritTurntime = 0;
+        return;
       }
       this.args.inheritTurntime =
         this.inheritTurnTimeMinute * 60 + this.inheritTurnTimeSecond;
diff --git a/src/sammo/TimeUtil.php b/src/sammo/TimeUtil.php
index 107b9dd1..c441af5a 100644
--- a/src/sammo/TimeUtil.php
+++ b/src/sammo/TimeUtil.php
@@ -140,9 +140,17 @@ class TimeUtil
 
     public static function secondsToDateInterval(float $fullSeconds): \DateInterval
     {
-        $d0 = new \DateTime("@0");
+        $inverted = $fullSeconds < 0?1:0;
 
-        return $d0->diff(static::secondsToDateTime($fullSeconds, true));
+        $fullSeconds = abs($fullSeconds);
+        $seconds = floor($fullSeconds);
+        $fraction = $fullSeconds - $seconds;
+
+        $interval = new \DateInterval("PT{$seconds}S");
+
+        $interval->f = $fraction;
+        $interval->invert = $inverted;
+        return $interval;
     }
 
     public static function DateTimeToSeconds(\DateTimeInterface $dateTime, bool $isUTC = false): float