diff --git a/src/backend/handler.js b/src/backend/handler.js
index 177deb8..2731741 100644
--- a/src/backend/handler.js
+++ b/src/backend/handler.js
@@ -30,8 +30,9 @@ module.exports.verifyEmail = async (event) => {
 // Skill
 
 module.exports.welcome = async (event) => {
-  if (await checkAuth(event) != null) {
-    const response = responseTemplate.welcome();
+  const auth = await checkAuth(event);
+  if (auth != null) {
+    const response = responseTemplate.welcome(auth);
     console.log(response);
     return response;
   } else {
diff --git a/src/backend/handlers/user.js b/src/backend/handlers/user.js
index 4bc92a8..c1dbf8c 100644
--- a/src/backend/handlers/user.js
+++ b/src/backend/handlers/user.js
@@ -56,16 +56,16 @@ const information = async (event) => {
   }
 };
 
-// Todo
 const openprofile = async (event) => {
   const userId = parser.getUserId(event);
+  const parameters = parser.getParameters(event);
+  const user_openprofile = parameters["user_openprofile"].origin;
 
-  const user = await database.getUser(userId);
-  if (user == null) {
-    return responseTemplate.userRegistration();
+  const result = await database.setOpenprofile(userId, user_openprofile);
+  if (result.success == true) {
+    return responseTemplate.userOpenprofileSuccess(user_openprofile);
   } else {
-    const openprofile = (user.openprofile == null ? "-" : user.openprofile);
-    return responseTemplate.userInformation(user.nickname, user.school_name, user.school_mail, openprofile, user.reliability_score);
+    return responseTemplate.processFail("오픈프로필 등록 실패", "오픈프로필 등록에 실패하였습니다.");
   }
 };
 
diff --git a/src/backend/responses/common.js b/src/backend/responses/common.js
index 5e5e0ef..f908f60 100644
--- a/src/backend/responses/common.js
+++ b/src/backend/responses/common.js
@@ -3,7 +3,7 @@
 const builder = require("../utils/builder");
 const resource = require("../utils/resource");
 
-module.exports.welcome = () => {
+module.exports.welcome = (user) => {
   // Construct buyer card
   const buyerThumbnail = builder.getThumbnail(resource.buyerThumbnailUrl);
   const buyerSearchTextButton = builder.getButton("상품 카테고리 검색", "block", "상품 카테고리 검색", resource.buyerSearchCategoryBlockId);
@@ -13,7 +13,8 @@ module.exports.welcome = () => {
 
   // Construct seller card
   const sellerThumbnail = builder.getThumbnail(resource.sellerThumbnailUrl);
-  const sellerItemRegistButton = builder.getButton("상품 등록", "block", "상품 등록", resource.sellerItemRegistBlockId);
+  const registLink =  (user.openprofile ? resource.sellerItemRegistBlockId : resource.userInfoOpenProfileBlockId);
+  const sellerItemRegistButton = builder.getButton("상품 등록", "block", "상품 등록", registLink);
   const sellerItemListButton = builder.getButton("상품 목록", "block", "상품 목록", resource.sellerItemListBlockId, {mode: "list"});
   const sellerContractButton = builder.getButton("판매자 거래 체결", "block", "판매자 거래 체결", resource.sellerItemListBlockId, {mode: "contract"});
   const sellerCardBody = builder.getBasicCardBody("판매", "상품을 판매합니다.", sellerThumbnail, [sellerItemRegistButton, sellerItemListButton, sellerContractButton]);
diff --git a/src/backend/responses/item.js b/src/backend/responses/item.js
index 5f69a83..d08f33a 100644
--- a/src/backend/responses/item.js
+++ b/src/backend/responses/item.js
@@ -49,7 +49,7 @@ module.exports.itemListSuccess = (itemList, mode="search") => {
         buttons.push(builder.getButton("상세정보", "block", "상세정보", resource.itemDetailBlockId, {itemId: resultItemId, mode: "list"}));
         buttons.push(builder.getButton("삭제", "block", "삭제", resource.itemDeleteWarningBlockId, {itemId: resultItemId, item_image: item.item_image[0]}));
       } else if (mode == "search") {
-        buttons.push(builder.getButton("구매", "block", "구매", resource.itemBuyBlockId, {userId: resultUserId, itemId: resultItemId}));
+        buttons.push(builder.getButton("판매자 연결", "webLink", (item.openprofile == null ? "" : item.openprofile)));
         buttons.push(builder.getButton("상세정보", "block", "상세정보", resource.itemDetailBlockId, {userId: resultUserId, itemId: resultItemId, mode: "search"}));
       } else if (mode == "contract") {
         buttons.push(builder.getButton("판매", "block", "판매", resource.sellerContractBlockId, {itemId: resultItemId}));
@@ -83,7 +83,7 @@ module.exports.itemDetail = (item, mode="list", user=null) => {
   const resultTitle = item.item_name + "(" + item.item_price + "원)";
   const resultDescription = item.item_detail + "\n"+ item.item_date;
   const resultMainMenuButton = (mode == "list" ? builder.getButton("삭제", "block", "삭제", resource.itemDeleteWarningBlockId, {itemId: item.itemId, item_image: item.item_image[0]})
-                                               : builder.getButton("구매", "block", "구매", resource.itemBuyBlockId, {userId: resultUserId, itemId: resultItemId}));
+                                               : builder.getButton("판매자 연결", "webLink", item.openprofile));
   const resultCard1 = builder.getBasicCardBody(resultTitle, resultDescription, "", [resultMainMenuButton, resultMainMenuButton]);
   const resultCard2 = builder.getBasicCardBody("", "", resultThumbnail);
 
diff --git a/src/backend/responses/template.js b/src/backend/responses/template.js
index 80c09fe..63aebcd 100644
--- a/src/backend/responses/template.js
+++ b/src/backend/responses/template.js
@@ -22,5 +22,6 @@ module.exports = {
   itemBuyerContractSuccess: itemResponse.itemBuyerContractSuccess,
   itemDeleteWarning: itemResponse.itemDeleteWarning,
   itemDeleteOk: itemResponse.itemDeleteOk,
-  itemDeleteCancel: itemResponse.itemDeleteCancel
+  itemDeleteCancel: itemResponse.itemDeleteCancel,
+  userOpenprofileSuccess: userResponse.userOpenprofileSuccess
 };
diff --git a/src/backend/responses/user.js b/src/backend/responses/user.js
index b682194..33b5e09 100644
--- a/src/backend/responses/user.js
+++ b/src/backend/responses/user.js
@@ -63,3 +63,9 @@ module.exports.userAuthenticationSuccess = () => {
 module.exports.userAuthenticationFail = () => {
   return builder.buildAWSResponse("Mail authentication fail!");
 };
+
+module.exports.userOpenprofileSuccess = (openprofile) => {
+  const listItem = builder.getListItem(openprofile, "오픈프로필 링크");
+  const listCard = builder.getListCard("오픈프로필 등록 성공", "", [listItem]);
+  return builder.buildResponse([listCard]);
+};
diff --git a/src/backend/utils/database.js b/src/backend/utils/database.js
index caf02d7..d524c2a 100644
--- a/src/backend/utils/database.js
+++ b/src/backend/utils/database.js
@@ -501,5 +501,6 @@ module.exports = {
   registNewDeal,
   deleteItem,
   deleteUser,
-  getTransaction
+  getTransaction,
+  setOpenprofile
 }