diff --git a/Assets/Prefabs/AAA/Panel_APISetting.prefab b/Assets/Prefabs/AAA/Panel_APISetting.prefab
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+--- !u!222 &4142298848317189371
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+  m_PrefabAsset: {fileID: 0}
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+--- !u!114 &2556222921098272474
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@@ -1315,6 +1902,7 @@ RectTransform:
   m_Children:
   - {fileID: 4463847530505855796}
   - {fileID: 4536383871410992554}
+  - {fileID: 7996241376411540362}
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diff --git a/Assets/Scripts/Studio/UI/Elements/UI_APIConnection.cs b/Assets/Scripts/Studio/UI/Elements/UI_APIConnection.cs
index 4b2f16e7..d6a0f19b 100644
--- a/Assets/Scripts/Studio/UI/Elements/UI_APIConnection.cs
+++ b/Assets/Scripts/Studio/UI/Elements/UI_APIConnection.cs
@@ -122,6 +122,8 @@ namespace Studio.UI
             }
             return apiConnection;
         }
+
+        private APIConnection prevAPIData;
         public void SetAPIConnection(APIConnection apiConnection)
         {
             InputField_Domain.text = apiConnection.domain;
@@ -137,5 +139,80 @@ namespace Studio.UI
                 Button_AddURLItem.transform.SetAsLastSibling();
             }
         }
+
+        public void RevertInfo(APIConnection apiconnection)
+        {
+            prevAPIData = apiconnection;
+            InputField_Domain.text = prevAPIData.domain;
+            InputField_Port.text = prevAPIData.port;
+            ItemRemoveOrCreate();
+            RevertTopic();
+            ReSizeRect();
+        }
+
+        private void ReSizeRect()
+        {
+            var verticalLayoutGroup = URLItemContent.GetComponent<VerticalLayoutGroup>();
+            var itemHeight = 0f;
+            foreach (var item in inputURLItems)
+            {
+                itemHeight += item.rectTransform.rect.height;
+            }
+            var height = 180f + itemHeight + (verticalLayoutGroup.spacing * inputURLItems.Count);
+
+            rectTransform.sizeDelta = new Vector2(rectTransform.sizeDelta.x, height);
+        }
+
+        private void ItemRemoveOrCreate()
+        {
+            var gapCount = inputURLItems.Count - prevAPIData.urls.Count;
+
+            if (gapCount > 0)
+            {
+                for (int i = gapCount; i > 0; i--)
+                {
+                    Destroy(inputURLItems[i].gameObject);
+                    inputURLItems.Remove(inputURLItems[i]);
+                }
+            }
+            else if (gapCount < 0)
+            {
+                var count = MathF.Abs(gapCount);
+                for (int i = 0; i < count; i++)
+                {
+                    OnClickAddURLItemButton();
+                }
+            }
+        }
+
+        private void RevertTopic()
+        {
+            int index = 0;
+
+            foreach (var item in inputURLItems)
+            {
+                //이전상태로 되돌리기 ; 
+                item.SetURL(prevAPIData.urls[index]);
+                index++;
+            }
+        }
+
+        public void SaveItem()
+        {
+            if (prevAPIData == null)
+            {
+                prevAPIData = GetAPIConnection();
+            }
+
+            prevAPIData.domain = InputField_Domain.text;
+            prevAPIData.port = InputField_Port.text;
+
+            var urls = new List<URL>();
+            foreach (var item in inputURLItems)
+            {
+                urls.Add(item.GetURL());
+            }
+            prevAPIData.urls = urls;
+        }
     }
 }
diff --git a/Assets/Scripts/Studio/UI/Panel/Panel_APISetting.cs b/Assets/Scripts/Studio/UI/Panel/Panel_APISetting.cs
index f5b07b23..766f2957 100644
--- a/Assets/Scripts/Studio/UI/Panel/Panel_APISetting.cs
+++ b/Assets/Scripts/Studio/UI/Panel/Panel_APISetting.cs
@@ -1,9 +1,10 @@
+using Studio.Util;
+using System;
 using System.Collections.Generic;
+using System.Linq;
 using UnityEngine;
 using UnityEngine.UI;
 using XRLib.UI;
-using System;
-using Studio.Util;
 
 namespace Studio.UI
 {
@@ -16,10 +17,15 @@ namespace Studio.UI
 
         private UI_APIConnection prf_APIConnectionItem;
         private List<UI_APIConnection> apiConnectionItems = new List<UI_APIConnection>();
-
         public Action onClose;
-
         public Button Button_Close;
+
+        private Button Button_OK;
+        private Button Button_Cancel;
+
+        private APISetting prevAPISetting;
+        private List<UI_APIConnection> prevAPIConnectionItems = new List<UI_APIConnection>();
+
         public void Active(bool isActive)
         {
             SetActive(isActive);
@@ -35,7 +41,83 @@ namespace Studio.UI
 
             Button_AddAPIConnectionItem.onClick.AddListener(OnClickAddAPIConnectionItemButton);
             apiConnectionItems.Clear();
-            Button_Close.onClick.AddListener(() => Active(false));
+            var btns = GetComponentsInChildren<Button>();
+            Button_OK = btns.FirstOrDefault(x => x.name.Equals(nameof(Button_OK)));
+            Button_Cancel = btns.FirstOrDefault(x => x.name.Equals(nameof(Button_Cancel)));
+
+            Button_OK.onClick.AddListener(Save);
+            Button_Cancel.onClick.AddListener(Close);
+            Button_Close.onClick.AddListener(Close);
+        }
+        public void Open()
+        {
+            Active(true);
+            prevAPIConnectionItems.Clear();
+            foreach (var mqttitem in prevAPIConnectionItems)
+            {
+                prevAPIConnectionItems.Add(mqttitem);
+            }
+        }
+        private void Save()
+        {
+            var items = new List<APIConnection>();
+            foreach (var apiItem in apiConnectionItems)
+            {
+                items.Add(apiItem.GetAPIConnection());
+                apiItem.SaveItem();
+            }
+            if (prevAPISetting == null)
+            {
+                prevAPISetting = GetAPISetting();
+            }
+            prevAPISetting.apiConnections = items;
+            Active(false);
+        }
+        private void Close()
+        {
+            List<UI_APIConnection> item = new();
+            foreach (var apiItem in apiConnectionItems)
+            {
+                if (!prevAPIConnectionItems.Contains(apiItem))
+                {
+                    item.Add(apiItem);
+                }
+            }
+
+            for (int i = 0; i < item.Count; i++)
+            {
+                RemoveAPIConnectionItem(item[i]);
+            }
+            RevertState();
+            Active(false);
+        }
+        private void RevertState()
+        {
+            if (prevAPISetting == null)
+            {
+                prevAPISetting = GetAPISetting();
+            }
+
+            ItemCreate();
+
+            var index = 0;
+            foreach (var mqttitem in apiConnectionItems)
+            {
+                mqttitem.RevertInfo(prevAPISetting.apiConnections[index]);
+                index++;
+            }
+        }
+        private void ItemCreate()
+        {
+            var gapCount = apiConnectionItems.Count - prevAPISetting.apiConnections.Count;
+            if (gapCount < 0)
+            {
+                var count = MathF.Abs(gapCount);
+                for (int i = 0; i < count; i++)
+                {
+                    OnClickAddAPIConnectionItemButton();
+                }
+            }
         }
         private void OnClickAddAPIConnectionItemButton()
         {
diff --git a/Assets/Scripts/Studio/UI/Panel/Panel_StudioTopBar.cs b/Assets/Scripts/Studio/UI/Panel/Panel_StudioTopBar.cs
index 1352fc2e..34ed7b8d 100644
--- a/Assets/Scripts/Studio/UI/Panel/Panel_StudioTopBar.cs
+++ b/Assets/Scripts/Studio/UI/Panel/Panel_StudioTopBar.cs
@@ -114,7 +114,7 @@ namespace Studio.UI
         private void OnClickAPISetting()
         {
             Debug.Log("On TopMenu Click API Setting");
-            CanvasManager.instance.GetCanvas<Canvas_Popup>().panel_apisetting.SetActive(true);
+            CanvasManager.instance.GetCanvas<Canvas_Popup>().panel_apisetting.Open();
         }
 
         private void OnClickAuthSetting()