diff --git a/README.md b/README.md
index 3da11a298..543454e3d 100644
--- a/README.md
+++ b/README.md
@@ -133,6 +133,8 @@ Hydro 用户群：1085853538
 - import-qduoj: 修复 spj=null
 - core: 修复文件复制
 - core: 支持存储并显示提交记录重测历史
+- core: 新的加域逻辑
+- ui: UserSelect.Multi: 支持批量粘贴用户名
 
 ### Breaking API Changes
 
@@ -144,6 +146,7 @@ Hydro 用户群：1085853538
 - core: 移除 global.Hydro.ui.template
 - core: 移除 global.Hydro.lib
 - core: 移除 String.prototype.translate (使用 app.i18n.translate)
+- core: 升级至 Mongo Driver 6
 
 ## Hydro 4.19.0 / UI 4.57.0
 
diff --git a/packages/hydrooj/locales/ko.yaml b/packages/hydrooj/locales/ko.yaml
index d161b258e..c2b01ebe4 100644
--- a/packages/hydrooj/locales/ko.yaml
+++ b/packages/hydrooj/locales/ko.yaml
@@ -688,7 +688,6 @@ The role to assign when user joining the domain.: 사용자가 그룹에 참여
 The uploaded file is too long.: 업로드한 파일이 너무 깁니다.
 The user is already a member of the domain.: 이미 그룹에 속한 사용자입니다.
 The user is too lazy to leave something here...: 설명이 없습니다... (´・ω・｀)
-Their account will not be deleted and they will be with the default role.: 계정은 삭제되지 않을 것이고, default 역할을 가질 것입니다.
 There are no contests...: 대회 없음
 There is no homework so far ╰(*°▽°*)╯: 과제 없음 ╰(*°▽°*)╯
 This contest is not live.: 대회가 실시간이 아닙니다.
@@ -810,6 +809,7 @@ You cannot visit this domain.: 이 그룹을 방문할 수 없습니다.
 You don't have the required permission ({0}) in this domain.: 그룹 권한이 없습니다. ({0})。
 You don't have the required privilege.: 권한이 없습니다.
 You don't own any domain and don't have privilege to create domain.: 그룹을 만들 권한이 없습니다.
+You have been kicked from domain {0} by {1}.: 당신은 {1}에 의해 {0}에서 추방되었습니다.
 You have not submitted any solutions for this problem: 아직 답안을 제출하지 않았습니다.
 You have permission to create problems for this domain.: 이 그룹에서 문제를 만들기 위한 권한이 있습니다.
 You have uncompleted domain creation operation. You can click "Continue" to finish the creation.: 그룹 생성이 끝나지 않았습니다. "계속"을 눌러 생성을 완료하십시오.
diff --git a/packages/hydrooj/locales/zh.yaml b/packages/hydrooj/locales/zh.yaml
index 525a629f2..97a579d76 100644
--- a/packages/hydrooj/locales/zh.yaml
+++ b/packages/hydrooj/locales/zh.yaml
@@ -792,7 +792,6 @@ The role to assign when user joining the domain.: 用户加入此域时分配的
 The uploaded file is too long.: 上传的文件太长。
 The user is already a member of the domain.: 该用户已是域的成员。
 The user is too lazy to leave something here...: 该用户太懒，这里啥也没写 (´・ω・｀)
-Their account will not be deleted and they will be with the default role.: 他们的账号不会被删除，并且之后将以 default 角色访问。
 theme: 主题
 There are no contests...: 没有比赛…
 There is no homework so far ╰(*°▽°*)╯: 目前还没有作业 ╰(*°▽°*)╯
@@ -934,6 +933,7 @@ You cannot visit this domain.: 您不能访问此域。
 You don't have the required permission ({0}) in this domain.: 您在该域中无相应权限 ({0})。
 You don't have the required privilege.: 您没有相应的特权。
 You don't own any domain and don't have privilege to create domain.: 您不拥有任何域也没有创建域的特权。
+You have been kicked from domain {0} by {1}.: 您已被 {1} 从域 {0} 中移除。
 You have not submitted any solutions for this problem: 您在该题下没有递交过任何解答
 You have permission to create problems for this domain.: 您有权限为此域创建题目。
 You have uncompleted domain creation operation. You can click "Continue" to finish the creation.: 您有未完成的创建域操作。您可以点击“继续”来完成创建。
diff --git a/packages/hydrooj/locales/zh_TW.yaml b/packages/hydrooj/locales/zh_TW.yaml
index 2cbe7f943..e16a4dedb 100644
--- a/packages/hydrooj/locales/zh_TW.yaml
+++ b/packages/hydrooj/locales/zh_TW.yaml
@@ -463,7 +463,6 @@ Technical Information: 技術資訊
 Temporary session: 臨時會話
 Text: 文字
 The homework's deadline is due but in extension. You can still submit for this problem but your score will be penalized.: 功課已經截止，但處於延期時間内。您此時遞交的題目無法獲得全部分數。
-Their account will not be deleted and they will be with the default role.: 他們的賬號不會被刪除，並且之後將以 default 角色訪問。
 There are no contests...: 沒有比賽…
 There is no homework so far ╰(*°▽°*)╯: 目前沒有功課 ╰(*°▽°*)╯
 This contest is not live.: 比賽沒有開始。
@@ -551,6 +550,7 @@ You cannot submit for this problem because the homework's deadline is due.: 功
 You don't have the required permission ({0}) in this domain.: 您在該域中無相應許可權 ({0})。
 You don't have the required privilege.: 您沒有相應的特權。
 You don't own any domain and don't have privilege to create domain.: 您不擁有任何域也沒有創建域的特權。
+You have been kicked from domain {0} by {1}.: 您已被 {1} 從域 {0} 中移除。
 You have not submitted any solutions for this problem: 您在該題下沒有遞交過任何解答
 You have permission to create problems for this domain.: 您有許可權為此域創建題目。
 You haven't attended this contest yet.: 您還沒有參加本次比賽。
diff --git a/packages/hydrooj/src/handler/domain.ts b/packages/hydrooj/src/handler/domain.ts
index 80f195765..52a398e93 100644
--- a/packages/hydrooj/src/handler/domain.ts
+++ b/packages/hydrooj/src/handler/domain.ts
@@ -11,6 +11,7 @@ import avatar from '../lib/avatar';
 import { PERM, PERMS_BY_FAMILY, PRIV } from '../model/builtin';
 import * as discussion from '../model/discussion';
 import domain from '../model/domain';
+import MessageModel from '../model/message';
 import * as oplog from '../model/oplog';
 import { DOMAIN_SETTINGS, DOMAIN_SETTINGS_BY_KEY } from '../model/setting';
 import * as system from '../model/system';
@@ -163,11 +164,15 @@ class DomainUserHandler extends ManageHandler {
         };
     }
 
+    @param('uids', Types.NumericArray)
+    async post({ }, uids: number[]) {
+        if (uids.includes(this.domain.owner)) throw new ForbiddenError();
+    }
+
     @requireSudo
-    @post('uid', Types.Int)
-    @post('role', Types.Role)
-    async postSetUser(domainId: string, uid: number, role: string) {
-        if (uid === this.domain.owner) throw new ForbiddenError();
+    @param('uids', Types.NumericArray)
+    @param('role', Types.Role)
+    async postSetUsers(domainId: string, uid: number[], role: string) {
         await Promise.all([
             domain.setUserRole(domainId, uid, role),
             oplog.log(this, 'domain.setRole', { uid, role }),
@@ -176,14 +181,20 @@ class DomainUserHandler extends ManageHandler {
     }
 
     @requireSudo
-    @param('uid', Types.NumericArray)
-    @param('role', Types.Role)
-    async postSetUsers(domainId: string, uid: number[], role: string) {
-        if (uid.includes(this.domain.owner)) throw new ForbiddenError();
+    @param('uids', Types.NumericArray)
+    async postKick({ domainId }, uids: number[]) {
+        const original = await domain.getMultiUserInDomain(domainId, { uid: { $in: uids } }).toArray();
+        const needUpdate = uids.filter((uid) => original.find((i) => i.uid === uid)?.join);
+        if (!needUpdate.length) return;
         await Promise.all([
-            domain.setUserRole(domainId, uid, role),
-            oplog.log(this, 'domain.setRole', { uid, role }),
+            domain.setJoin(domainId, needUpdate.length > 1 ? needUpdate : needUpdate[0], false),
+            oplog.log(this, 'domain.kick', { uids: needUpdate }),
         ]);
+        const msg = JSON.stringify({
+            message: 'You have been kicked from domain {0} by {1}.',
+            params: [this.domain.name, this.user.uname],
+        });
+        await Promise.all(needUpdate.map((i) => MessageModel.send(1, i, msg, MessageModel.FLAG_RICHTEXT | MessageModel.FLAG_UNREAD)));
         this.back();
     }
 }
diff --git a/packages/hydrooj/src/handler/home.ts b/packages/hydrooj/src/handler/home.ts
index 3b58113dd..3253e361c 100644
--- a/packages/hydrooj/src/handler/home.ts
+++ b/packages/hydrooj/src/handler/home.ts
@@ -488,7 +488,7 @@ class HomeDomainHandler extends Handler {
         } else {
             for (const ddoc of ddocs) {
                 // eslint-disable-next-line no-await-in-loop
-                const udoc = (await user.getById(ddoc._id, this.user._id))!;
+                const udoc = await user.getById(ddoc._id, this.user._id);
                 canManage[ddoc._id] = udoc.hasPerm(PERM.PERM_EDIT_DOMAIN);
                 role[ddoc._id] = udoc.role;
             }
@@ -504,6 +504,12 @@ class HomeDomainHandler extends Handler {
         else user.setById(this.user._id, { pinnedDomains: this.user.pinnedDomains.filter((i) => i !== id) });
         this.back({ star });
     }
+
+    @param('id', Types.String)
+    async postLeave({ }, id: string) {
+        await domain.setJoin(id, this.user._id, false);
+        this.back();
+    }
 }
 
 class HomeDomainCreateHandler extends Handler {
diff --git a/packages/hydrooj/src/model/domain.ts b/packages/hydrooj/src/model/domain.ts
index c40c60b78..39fedd717 100644
--- a/packages/hydrooj/src/model/domain.ts
+++ b/packages/hydrooj/src/model/domain.ts
@@ -135,7 +135,7 @@ class DomainModel {
     @ArgMethod
     static async setUserRole(domainId: string, uid: MaybeArray<number>, role: string, autojoin = false) {
         const update = { $set: { role, ...(autojoin ? { join: true } : {}) } };
-        if (!(uid instanceof Array)) {
+        if (!(Array.isArray(uid))) {
             const res = await collUser.findOneAndUpdate(
                 { domainId, uid },
                 update,
@@ -152,6 +152,15 @@ class DomainModel {
         return await collUser.updateMany({ domainId, uid: { $in: uid } }, update, { upsert: true });
     }
 
+    static async setJoin(domainId: string, uid: MaybeArray<number>, join: boolean) {
+        if (!(Array.isArray(uid))) {
+            await DomainModel.updateUserInDomain(domainId, uid, { $set: { join } });
+            return;
+        }
+        await collUser.updateMany({ domainId, uid: { $in: uid } }, { $set: { join } });
+        deleteUserCache(domainId);
+    }
+
     static async getRoles(domainId: string, count?: boolean): Promise<any[]>;
     static async getRoles(domain: DomainDoc, count?: boolean): Promise<any[]>;
     @ArgMethod
diff --git a/packages/ui-default/locales/ko.yaml b/packages/ui-default/locales/ko.yaml
index 44f8693c0..186fb1651 100644
--- a/packages/ui-default/locales/ko.yaml
+++ b/packages/ui-default/locales/ko.yaml
@@ -680,6 +680,7 @@ Terms of Service: 이용 약관
 Test data comes from: Testdata 출처
 Testdata Config: Testdata 설정
 Text: 본문
+Leave: 나가기
 The homework's deadline is due but in extension. You can still submit for this problem but your score will be penalized.: 추가 접수 중입니다. 제출할 수 있지만 감점될 수 있습니다.
 The invitation code to enter to successfully join the domain. You can only use letters and numbers in the code and it should not be longer than 64 characters.: 초대 코드는 64글자 미만입니다.
 The invitation code you provided is invalid.: 잘못된 초대 코드
@@ -688,7 +689,7 @@ The role to assign when user joining the domain.: 사용자가 그룹에 참여
 The uploaded file is too long.: 업로드한 파일이 너무 깁니다.
 The user is already a member of the domain.: 이미 그룹에 속한 사용자입니다.
 The user is too lazy to leave something here...: 설명이 없습니다... (´・ω・｀)
-Their account will not be deleted and they will be with the default role.: 계정은 삭제되지 않을 것이고, default 역할을 가질 것입니다.
+Their account will not be deleted and they will be with the guest role until they re-join the domain.: 계정은 삭제되지 않을 것이고, guest 역할을 가질 것입니다. 그룹에 다시 참여할 때까지 말이죠.
 There are no contests...: 대회 없음
 There is no homework so far ╰(*°▽°*)╯: 과제 없음 ╰(*°▽°*)╯
 This contest is not live.: 대회가 실시간이 아닙니다.
diff --git a/packages/ui-default/locales/zh.yaml b/packages/ui-default/locales/zh.yaml
index f92c2a57e..995fb2860 100644
--- a/packages/ui-default/locales/zh.yaml
+++ b/packages/ui-default/locales/zh.yaml
@@ -512,6 +512,7 @@ LaTeX Expressions: LaTeX 表达式
 Learn More: 了解更多
 Leave blank to use numeric pid.: 留空来使用数字题号。
 Leave empty for default: 留空以使用默认
+Leave: 离开
 Ledo: 乐多
 Legacy mode: 兼容模式
 Light: 亮色
@@ -916,7 +917,7 @@ The scoreboard was frozen with {0} minutes remaining at {1} - submissions in the
 The uploaded file is too long.: 上传的文件太长。
 The user is already a member of the domain.: 该用户已是域的成员。
 The user is too lazy to leave something here...: 该用户太懒，这里啥也没写 (´・ω・｀)
-Their account will not be deleted and they will be with the default role.: 他们的账号不会被删除，并且之后将以 default 角色访问。
+Their account will not be deleted and they will be with the guest role until they re-join the domain.: 他们的账号不会被删除，并且之后将以 guest 角色访问，直到他们重新加入域。
 Theme: 主题
 There are no contests...: 没有比赛…
 There is no homework so far ╰(*°▽°*)╯: 目前还没有作业 ╰(*°▽°*)╯
diff --git a/packages/ui-default/locales/zh_TW.yaml b/packages/ui-default/locales/zh_TW.yaml
index 1c04a70c4..4cb4a89d6 100644
--- a/packages/ui-default/locales/zh_TW.yaml
+++ b/packages/ui-default/locales/zh_TW.yaml
@@ -238,6 +238,7 @@ Last Submit At: 最後遞交於
 Last Update At: 最後活動時間
 LaTeX Expressions: LaTeX 表示式
 Learn More: 瞭解更多
+Leave: 離開
 Links: 連結
 List View: 列表視圖
 Live: 正在進行
@@ -462,7 +463,7 @@ Technical Information: 技術資訊
 Temporary session: 臨時會話
 Text: 文字
 The homework's deadline is due but in extension. You can still submit for this problem but your score will be penalized.: 功課已經截止，但處於延期時間内。您此時遞交的題目無法獲得全部分數。
-Their account will not be deleted and they will be with the default role.: 他們的賬號不會被刪除，並且之後將以 default 角色訪問。
+Their account will not be deleted and they will be with the guest role until they re-join the domain.: 他們的賬號不會被刪除，並且之後將以 guest 角色訪問，直到他們重新加入域。
 There are no contests...: 沒有比賽…
 There is no homework so far ╰(*°▽°*)╯: 目前沒有功課 ╰(*°▽°*)╯
 This contest is not live.: 比賽沒有開始。
diff --git a/packages/ui-default/pages/domain_user.page.js b/packages/ui-default/pages/domain_user.page.js
index 71884486a..11c804548 100644
--- a/packages/ui-default/pages/domain_user.page.js
+++ b/packages/ui-default/pages/domain_user.page.js
@@ -60,8 +60,8 @@ const page = new NamedPage('domain_user', () => {
     const role = addUserDialog.$dom.find('[name="role"]').val();
     try {
       await request.post('', {
-        operation: 'set_user',
-        uid: user._id,
+        operation: 'set_users',
+        uids: [user._id],
         role,
       });
       window.location.reload();
@@ -91,15 +91,14 @@ const page = new NamedPage('domain_user', () => {
       $body: tpl`
         <div class="typo">
           <p>${i18n('Confirm removing the selected users?')}</p>
-          <p>${i18n('Their account will not be deleted and they will be with the default role.')}</p>
+          <p>${i18n('Their account will not be deleted and they will be with the guest role until they re-join the domain.')}</p>
         </div>`,
     }).open();
     if (action !== 'yes') return;
     try {
       await request.post('', {
-        operation: 'set_users',
-        uid: selectedUsers,
-        role: 'default',
+        operation: 'kick',
+        uids: selectedUsers,
       });
       Notification.success(i18n('Selected users have been removed from the domain.'));
       await delay(2000);
@@ -122,7 +121,7 @@ const page = new NamedPage('domain_user', () => {
     try {
       await request.post('', {
         operation: 'set_users',
-        uid: selectedUsers,
+        uids: selectedUsers,
         role,
       });
       Notification.success(i18n('Role has been updated to {0} for selected users.', role));
@@ -138,8 +137,8 @@ const page = new NamedPage('domain_user', () => {
     const role = $(ev.currentTarget).val();
     try {
       await request.post('', {
-        operation: 'set_user',
-        uid: row.attr('data-uid'),
+        operation: 'set_users',
+        uids: [row.attr('data-uid')],
         role,
       });
       Notification.success(i18n('Role has been updated to {0}.', role));
diff --git a/packages/ui-default/pages/home_domain.page.styl b/packages/ui-default/pages/home_domain.page.styl
index fa69b807c..a50fd3c37 100644
--- a/packages/ui-default/pages/home_domain.page.styl
+++ b/packages/ui-default/pages/home_domain.page.styl
@@ -11,7 +11,7 @@
     border-left: 1px solid $table-border-color
 
   .col--action
-    width: rem(135px)
+    width: rem(200px)
 
   +mobile()
     .col--icon, .col--role
diff --git a/packages/ui-default/templates/home_domain.html b/packages/ui-default/templates/home_domain.html
index 81e9609bc..329f4be30 100644
--- a/packages/ui-default/templates/home_domain.html
+++ b/packages/ui-default/templates/home_domain.html
@@ -44,6 +44,11 @@
           {% if canManage[ddoc['_id']] %}
             · <a class="typo-a" href="{{ url('domain_dashboard', domainId=ddoc['_id']) }}">{{ _('Manage') }}</a>
           {% endif %}
+            · <form class="form--inline" method="post">
+              <input type="hidden" name="operation" value="leave">
+              <input type="hidden" name="id" value="{{ ddoc['_id'] }}">
+              <button class="typo-a" type="submit">{{ _('Leave') }}</button>
+            </form>
           </td>
         </tr>
       {%- endfor -%}