diff --git a/backend/coconut-leaf.py b/backend/coconut-leaf.py
index 02f31fd..0d3a689 100644
--- a/backend/coconut-leaf.py
+++ b/backend/coconut-leaf.py
@@ -9,7 +9,7 @@ import utils
 import database
 
 
-def GetUsernamePassword():
+def GetUsernamePassword() -> tuple[str, str]:
     print("What is the first username of this calendar system?")
     cache = input()
     while not utils.IsValidUsername(cache):
@@ -27,14 +27,19 @@ def GetUsernamePassword():
     return (username, password)
 
 
+def SetLoggingStyle(level: int) -> None:
+    logging.basicConfig(format="[%(levelname)s] %(message)s", level=level)
+
+
 if __name__ == "__main__":
-    print("Coconut-leaf")
-    print("A self-host, multi-account calendar system.")
-    print("Project: https://github.com/yyc12345/coconut-leaf")
-    print("===================")
+    # Set as INFO level in default first,
+    # and we will change it once we load the configuration file.
+    SetLoggingStyle(logging.INFO)
 
     # Receive arguments
-    parser = ArgumentParser(description="Coconut-leaf")
+    parser = ArgumentParser(
+        description="The server of light, self-host and multi-account calendar system."
+    )
     parser.add_argument(
         "-c",
         "--config",
@@ -54,16 +59,22 @@ if __name__ == "__main__":
     )
     args = parser.parse_args()
 
+    # Show splash
+    logging.info("Coconut-leaf")
+    logging.info("A light, self-host and multi-account calendar system")
+    logging.info("Project: https://github.com/yyc12345/coconut-leaf")
+    logging.info("===================")
+
     # Load config file
     try:
         config.setup_config(cast(Path, args.config))
     except Exception as e:
-        print(f"Error loading config file: {e}")
+        logging.critical(f"Error loading config file: {e}")
         sys.exit(1)
 
-    # Setup logging level
+    # Change logging level again according to whether enable debug mode
     logging_level = logging.DEBUG if config.get_config().others.debug else logging.INFO
-    logging.basicConfig(format='[%(levelname)s] %(message)s', level=logging_level)
+    SetLoggingStyle(logging_level)
 
     # Initialize the calendar system if needed
     if cast(bool, args.init):
diff --git a/backend/coconut-leaf.template.toml b/backend/coconut-leaf.template.toml
index 11dc165..5ed2c96 100644
--- a/backend/coconut-leaf.template.toml
+++ b/backend/coconut-leaf.template.toml
@@ -15,7 +15,7 @@ path = "coconut-leaf.db"
 # database = "coconut_leaf"
 
 [web]
-port = 8888
+port = 8848
 
 [others]
 auto-token-clean-duration = 86400
diff --git a/backend/server.py b/backend/server.py
index c37af1c..6c6c9d0 100644
--- a/backend/server.py
+++ b/backend/server.py
@@ -1,107 +1,23 @@
 from flask import Flask
-# from flask import g
-from flask import render_template
-from flask import url_for
 from flask import request
-# from flask import abort
-from flask import redirect
-
-# from functools import reduce
-# import json
-# import os
-
 import config
 import database
 import utils
-from pathlib import Path
 
-_FRONTEND_PATH = Path(__file__).resolve().parent.parent / "frontend"
-app = Flask(
-    __name__,
-    static_folder=_FRONTEND_PATH / "static",
-    template_folder=_FRONTEND_PATH / "templates",
-)
+app = Flask(__name__)
 calendar_db = database.CalendarDatabase()
 
-# render_static_resources = None
+# region: API Route
 
-# =============================================database
+# region: Common
 
-# def get_database():
-#     db = getattr(g, '_database', None)
-#     if db is None:
-#         db = database.CalendarDatabase()
-#         db.open()
-#     return db
-
-# @app.teardown_appcontext
-# def close_database(exception):
-#     db = getattr(g, '_database', None)
-#     if db is not None:
-#         db.close()
-
-
-# ============================================= static page route
-
-@app.route('/', methods=['GET'])
-def nospecHandle():
-    return redirect(url_for('web_homeHandle'))
-
-@app.route('/web/home', methods=['GET'])
-def web_homeHandle():
-    # UpdateStaticResources()
-    return render_template("home.html")
-
-@app.route('/web/calendar', methods=['GET'])
-def web_calendarHandle():
-    # UpdateStaticResources()
-    return render_template("calendar.html")
-
-@app.route('/web/todo', methods=['GET'])
-def web_todoHandle():
-    # UpdateStaticResources()
-    return render_template("todo.html")
-
-@app.route('/web/admin', methods=['GET'])
-def web_adminHandle():
-    # UpdateStaticResources()
-    return render_template("admin.html")
-
-@app.route('/web/login', methods=['GET'])
-def web_loginHandle():
-    # UpdateStaticResources()
-    return render_template("login.html")
-
-@app.route('/web/collection', methods=['GET'])
-def web_collectionHandle():
-    # UpdateStaticResources()
-    return render_template("collection.html")
-
-@app.route('/web/eventAdd', methods=['GET'])
-def web_eventAddHandle():
-    # UpdateStaticResources()
-    return render_template("event.html",
-        uuidPath=''
-    )
-
-@app.route('/web/eventUpdate/<path:uuidPath>', methods=['GET'])
-def web_eventUpdateHandle(uuidPath):
-    # UpdateStaticResources()
-    return render_template("event.html",
-        uuidPath = uuidPath
-    )
-
-# ============================================= query page route
-
-# ================================ common
-
-@app.route('/api/common/salt', methods=['POST'])
+@app.route('/common/salt', methods=['POST'])
 def api_common_saltHandle():
     return SmartDbCaller(calendar_db.common_salt, 
     (('username', str, False), ),
     None)
 
-@app.route('/api/common/login', methods=['POST'])
+@app.route('/common/login', methods=['POST'])
 def api_common_loginHandle():
     # construct client data first
     clientUa = request.user_agent.string
@@ -120,7 +36,7 @@ def api_common_loginHandle():
         'clientIp': clientIp
     })
 
-@app.route('/api/common/webLogin', methods=['POST'])
+@app.route('/common/webLogin', methods=['POST'])
 def api_common_webLoginHandle():
     # construct client data first
     clientUa = request.user_agent.string
@@ -139,21 +55,23 @@ def api_common_webLoginHandle():
         'clientIp': clientIp
     })
 
-@app.route('/api/common/logout', methods=['POST'])
+@app.route('/common/logout', methods=['POST'])
 def api_common_logoutHandle():
     return SmartDbCaller(calendar_db.common_logout, 
     (('token', str, False), ),
     None)
 
-@app.route('/api/common/tokenValid', methods=['POST'])
+@app.route('/common/tokenValid', methods=['POST'])
 def api_common_tokenValidHandle():
     return SmartDbCaller(calendar_db.common_tokenValid, 
     (('token', str, False), ),
     None)
 
-# ================================ calendar
+# endregion
 
-@app.route('/api/calendar/getFull', methods=['POST'])
+# region: Calendar
+
+@app.route('/calendar/getFull', methods=['POST'])
 def api_calendar_getFullHandle():
     return SmartDbCaller(calendar_db.calendar_getFull, 
     (('token', str, False),
@@ -161,7 +79,7 @@ def api_calendar_getFullHandle():
     ('endDateTime', int, False)),
     None)
 
-@app.route('/api/calendar/getList', methods=['POST'])
+@app.route('/calendar/getList', methods=['POST'])
 def api_calendar_getListHandle():
     return SmartDbCaller(calendar_db.calendar_getList, 
     (('token', str, False),
@@ -169,14 +87,14 @@ def api_calendar_getListHandle():
     ('endDateTime', int, False)),
     None)
 
-@app.route('/api/calendar/getDetail', methods=['POST'])
+@app.route('/calendar/getDetail', methods=['POST'])
 def api_calendar_getDetailHandle():
     return SmartDbCaller(calendar_db.calendar_getDetail, 
     (('token', str, False),
     ('uuid', str, False)),
     None)
 
-@app.route('/api/calendar/update', methods=['POST'])
+@app.route('/calendar/update', methods=['POST'])
 def api_calendar_updateHandle():
     return SmartDbCaller(calendar_db.calendar_update, 
     (('token', str, False),
@@ -191,7 +109,7 @@ def api_calendar_updateHandle():
     ('lastChange', str, False)),
     None)
 
-@app.route('/api/calendar/add', methods=['POST'])
+@app.route('/calendar/add', methods=['POST'])
 def api_calendar_addHandle():
     return SmartDbCaller(calendar_db.calendar_add, 
     (('token', str, False),
@@ -204,7 +122,7 @@ def api_calendar_addHandle():
     ('timezoneOffset', int, False)),
     None)
 
-@app.route('/api/calendar/delete', methods=['POST'])
+@app.route('/calendar/delete', methods=['POST'])
 def api_calendar_deleteHandle():
     return SmartDbCaller(calendar_db.calendar_delete, 
     (('token', str, False),
@@ -212,35 +130,37 @@ def api_calendar_deleteHandle():
     ('lastChange', str, False)),
     None)
 
-# ================================ collection
+# endregion
 
-@app.route('/api/collection/getFullOwn', methods=['POST'])
+# region: Collection
+
+@app.route('/collection/getFullOwn', methods=['POST'])
 def api_collection_getFullOwnHandle():
     return SmartDbCaller(calendar_db.collection_getFullOwn, 
     (('token', str, False), ),
     None)
 
-@app.route('/api/collection/getListOwn', methods=['POST'])
+@app.route('/collection/getListOwn', methods=['POST'])
 def api_collection_getListOwnHandle():
     return SmartDbCaller(calendar_db.collection_getListOwn, 
     (('token', str, False), ),
     None)
 
-@app.route('/api/collection/getDetailOwn', methods=['POST'])
+@app.route('/collection/getDetailOwn', methods=['POST'])
 def api_collection_getDetailOwnHandle():
     return SmartDbCaller(calendar_db.collection_getDetailOwn, 
     (('token', str, False), 
     ('uuid', str, False)),
     None)
 
-@app.route('/api/collection/addOwn', methods=['POST'])
+@app.route('/collection/addOwn', methods=['POST'])
 def api_collection_addOwnHandle():
     return SmartDbCaller(calendar_db.collection_addOwn, 
     (('token', str, False), 
     ('name', str, False)),
     None)
 
-@app.route('/api/collection/updateOwn', methods=['POST'])
+@app.route('/collection/updateOwn', methods=['POST'])
 def api_collection_updateOwnHandle():
     return SmartDbCaller(calendar_db.collection_updateOwn, 
     (('token', str, False), 
@@ -249,7 +169,7 @@ def api_collection_updateOwnHandle():
     ('lastChange', str, False)),
     None)
 
-@app.route('/api/collection/deleteOwn', methods=['POST'])
+@app.route('/collection/deleteOwn', methods=['POST'])
 def api_collection_deleteOwnHandle():
     return SmartDbCaller(calendar_db.collection_deleteOwn, 
     (('token', str, False), 
@@ -258,14 +178,14 @@ def api_collection_deleteOwnHandle():
     None)
 
 
-@app.route('/api/collection/getSharing', methods=['POST'])
+@app.route('/collection/getSharing', methods=['POST'])
 def api_collection_getSharingHandle():
     return SmartDbCaller(calendar_db.collection_getSharing, 
     (('token', str, False), 
     ('uuid', str, False)),
     None)
 
-@app.route('/api/collection/deleteSharing', methods=['POST'])
+@app.route('/collection/deleteSharing', methods=['POST'])
 def api_collection_deleteSharingHandle():
     return SmartDbCaller(calendar_db.collection_deleteSharing, 
     (('token', str, False), 
@@ -274,7 +194,7 @@ def api_collection_deleteSharingHandle():
     ('lastChange', str, False)),
     None)
 
-@app.route('/api/collection/addSharing', methods=['POST'])
+@app.route('/collection/addSharing', methods=['POST'])
 def api_collection_addSharingHandle():
     return SmartDbCaller(calendar_db.collection_addSharing, 
     (('token', str, False), 
@@ -284,40 +204,42 @@ def api_collection_addSharingHandle():
     None)
 
 
-@app.route('/api/collection/getShared', methods=['POST'])
+@app.route('/collection/getShared', methods=['POST'])
 def api_collection_getSharedHandle():
     return SmartDbCaller(calendar_db.collection_getShared, 
     (('token', str, False), ),
     None)
 
-# ================================ todo
+# endregion
 
-@app.route('/api/todo/getFull', methods=['POST'])
+# region: Todo
+
+@app.route('/todo/getFull', methods=['POST'])
 def api_todo_getFullHandle():
     return SmartDbCaller(calendar_db.todo_getFull, 
     (('token', str, False), ),
     None)
 
-@app.route('/api/todo/getList', methods=['POST'])
+@app.route('/todo/getList', methods=['POST'])
 def api_todo_getListHandle():
     return SmartDbCaller(calendar_db.todo_getList, 
     (('token', str, False), ),
     None)
 
-@app.route('/api/todo/getDetail', methods=['POST'])
+@app.route('/todo/getDetail', methods=['POST'])
 def api_todo_getDetailHandle():
     return SmartDbCaller(calendar_db.todo_getDetail, 
     (('token', str, False), 
     ('uuid', str, False)),
     None)
 
-@app.route('/api/todo/add', methods=['POST'])
+@app.route('/todo/add', methods=['POST'])
 def api_todo_addHandle():
     return SmartDbCaller(calendar_db.todo_add, 
     (('token', str, False), ),
     None)
 
-@app.route('/api/todo/update', methods=['POST'])
+@app.route('/todo/update', methods=['POST'])
 def api_todo_updateHandle():
     return SmartDbCaller(calendar_db.todo_update, 
     (('token', str, False), 
@@ -326,7 +248,7 @@ def api_todo_updateHandle():
     ('lastChange', str, False)),
     None)
 
-@app.route('/api/todo/delete', methods=['POST'])
+@app.route('/todo/delete', methods=['POST'])
 def api_todo_deleteHandle():
     return SmartDbCaller(calendar_db.todo_delete, 
     (('token', str, False), 
@@ -334,22 +256,24 @@ def api_todo_deleteHandle():
     ('lastChange', str, False)),
     None)
 
-# ================================ admin
+# endregion
 
-@app.route('/api/admin/get', methods=['POST'])
+# region: Admin
+
+@app.route('/admin/get', methods=['POST'])
 def api_admin_getHandle():
     return SmartDbCaller(calendar_db.admin_get, 
     (('token', str, False), ),
     None)
 
-@app.route('/api/admin/add', methods=['POST'])
+@app.route('/admin/add', methods=['POST'])
 def api_admin_addHandle():
     return SmartDbCaller(calendar_db.admin_add, 
     (('token', str, False), 
     ('username', str, False)),
     None)
 
-@app.route('/api/admin/update', methods=['POST'])
+@app.route('/admin/update', methods=['POST'])
 def api_admin_updateHandle():
     return SmartDbCaller(calendar_db.admin_update, 
     (('token', str, False), 
@@ -358,60 +282,48 @@ def api_admin_updateHandle():
     ('isAdmin', utils.Str2Bool, True)),
     None)
 
-@app.route('/api/admin/delete', methods=['POST'])
+@app.route('/admin/delete', methods=['POST'])
 def api_admin_deleteHandle():
     return SmartDbCaller(calendar_db.admin_delete, 
     (('token', str, False), 
     ('username', str, False)),
     None)
 
-# ================================ profile
+# endregion
 
-@app.route('/api/profile/isAdmin', methods=['POST'])
+# region: Profile
+
+@app.route('/profile/isAdmin', methods=['POST'])
 def api_profile_isAdminHandle():
     return SmartDbCaller(calendar_db.profile_isAdmin, 
     (('token', str, False), ),
     None)
 
-@app.route('/api/profile/changePassword', methods=['POST'])
+@app.route('/profile/changePassword', methods=['POST'])
 def api_profile_changePasswordHandle():
     return SmartDbCaller(calendar_db.profile_changePassword, 
     (('token', str, False),
     ('password', str, False)),
     None)
 
-@app.route('/api/profile/getToken', methods=['POST'])
+@app.route('/profile/getToken', methods=['POST'])
 def api_profile_getTokenHandle():
     return SmartDbCaller(calendar_db.profile_getToken, 
     (('token', str, False), ),
     None)
 
-@app.route('/api/profile/deleteToken', methods=['POST'])
+@app.route('/profile/deleteToken', methods=['POST'])
 def api_profile_deleteTokenHandle():
     return SmartDbCaller(calendar_db.profile_deleteToken, 
     (('token', str, False),
     ('deleteToken', str, False)),
     None)
 
-# =============================================main run
+# endregion
 
-'''
-def UpdateStaticResources():
-    global render_static_resources
-    if render_static_resources is not None:
-        return
+# endregion
 
-    render_static_resources = {
-        'url_js_localStorageAssist': url_for('static', filename='js/localStorageAssist.js'),
-        'url_js_i18n': url_for('static', filename='js/i18n.js'),
-        'url_js_api': url_for('static', filename='js/api.js'),
-        'url_js_headerNav': url_for('static', filename='js/headerNav.js'),
-
-        'url_tmpl_headerNac': url_for('static', filename='tmpl/headerNav.tmpl'),
-
-        'url_js_pageHome': url_for('static', filename='js/page/home.js')
-    }
-'''
+# region: Misc Functions
 
 def SmartDbCaller(dbMethod, paramTuple, extraDict):
     result = (False, 'Invalid parameter', None)
@@ -454,4 +366,5 @@ def run():
     calendar_db.open()
     app.run(port=config.get_config().web.port)
     calendar_db.close()
-    
\ No newline at end of file
+    
+# endregion