diff --git a/Assets/External/OptiTrack Unity Plugin/OptiTrack/Scripts/Editor/UXML/OptitrackStreamingClientEditor.uxml b/Assets/External/OptiTrack Unity Plugin/OptiTrack/Scripts/Editor/UXML/OptitrackStreamingClientEditor.uxml
index 9322e1912..24e04258f 100644
--- a/Assets/External/OptiTrack Unity Plugin/OptiTrack/Scripts/Editor/UXML/OptitrackStreamingClientEditor.uxml	
+++ b/Assets/External/OptiTrack Unity Plugin/OptiTrack/Scripts/Editor/UXML/OptitrackStreamingClientEditor.uxml	
@@ -30,6 +30,14 @@
             <uie:PropertyField binding-path="DrawForcePlates" label="Draw Force Plates"/>
             <uie:PropertyField binding-path="RecordOnPlay" label="Record On Play"/>
             <uie:PropertyField binding-path="SkipDataDescriptions" label="Skip Data Descriptions"/>
+            <uie:PropertyField binding-path="AutoReconnect" label="Auto Reconnect"/>
+        </ui:Foldout>
+    </ui:VisualElement>
+
+    <!-- Mirror Mode -->
+    <ui:VisualElement class="section">
+        <ui:Foldout text="Mirror Mode" value="true" class="section-foldout">
+            <uie:PropertyField binding-path="MirrorMode" label="Mirror Mode (좌우 반전)"/>
         </ui:Foldout>
     </ui:VisualElement>
 
diff --git a/Assets/External/OptiTrack Unity Plugin/OptiTrack/Scripts/OptitrackStreamingClient.cs b/Assets/External/OptiTrack Unity Plugin/OptiTrack/Scripts/OptitrackStreamingClient.cs
index ce86a1d0b..15ec18172 100644
--- a/Assets/External/OptiTrack Unity Plugin/OptiTrack/Scripts/OptitrackStreamingClient.cs	
+++ b/Assets/External/OptiTrack Unity Plugin/OptiTrack/Scripts/OptitrackStreamingClient.cs	
@@ -999,9 +999,9 @@ public class OptitrackStreamingClient : MonoBehaviour
         return map;
     }
 
-    /// <summary>YZ 평면 기준 회전 미러: X, Z 성분 부호 반전.</summary>
+    /// <summary>YZ 평면 기준 회전 미러 (R' = M·R·M, M=diag(-1,1,1)): Y, Z 성분 부호 반전.</summary>
     private static Quaternion MirrorOrientation( Quaternion q )
-        => new Quaternion( -q.x, q.y, -q.z, q.w );
+        => new Quaternion( q.x, -q.y, -q.z, q.w );
 
     /// <summary>YZ 평면 기준 위치 미러: X 성분 부호 반전.</summary>
     private static Vector3 MirrorPosition( Vector3 pos )