diff --git a/CHANGELOG.md b/CHANGELOG.md
index 8f778b495..057cb3487 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,28 @@
 
 All notable changes to this project will be documented in this file.
 
+## NOJ 0.17.4 Characinae Build Pack 4 - 2021-11-03
+This is a build version update for `0.17.0 Characinae`.
+
+**Important:** Rerun `npm ci` and `composer install` then `npm run production`.
+
+### Update Logs
+* **New:** NOJ now supports `contest.exsits` middleware.
+* **New:** NOJ now uses Github markdown style to render messages.
+* **Fixed:** A PHP7.4 compatibility bug causing contest details to return 500 when users don't have clearance.
+* **Improved:** Remastered contest routers.
+* **Security:** `encore/laravel-admin` is now at `1.8.16`.
+* **Security:** `laravel/framework` is now at `8.69.0`.
+* **Security:** `laravel/passport` is now at `10.2.0`.
+* **Security:** `laravel/ui` is now at `3.3.1`.
+* **Security:** `phpseclib/phpseclib` is now at `3.0.11`.
+* **Security:** `symfony/console` is now at `5.3.10`.
+* **Security:** `symfony/http-foundation` is now at `5.3.10`.
+* **Security:** `symfony/http-kernel` is now at `5.3.10`.
+* **Security:** `symfony/string` is now at `5.3.10`.
+* **Security:** `symfony/translation` is now at `5.3.10`.
+* **Security:** `symfony/var-dumper` is now at `5.3.10`.
+
 ## NOJ 0.17.3 Characinae Build Pack 3 - 2021-10-30
 This is a build version update for `0.17.0 Characinae`.
 
diff --git a/app/Http/Controllers/Contest/IndexController.php b/app/Http/Controllers/Contest/IndexController.php
index 37863f304..c64939ede 100644
--- a/app/Http/Controllers/Contest/IndexController.php
+++ b/app/Http/Controllers/Contest/IndexController.php
@@ -70,7 +70,11 @@ public function detail($cid)
         if (Auth::check()) {
             $contest_detail=$contestModel->detail($cid, Auth::user()->id);
             $registration=$contestModel->registration($cid, Auth::user()->id);
-            $inGroup=$groupModel->isMember($contest_detail["data"]["contest_detail"]["gid"], Auth::user()->id);
+            if(filled($contest_detail["data"])) {
+                $inGroup=$groupModel->isMember($contest_detail["data"]["contest_detail"]["gid"], Auth::user()->id);
+            } else {
+                $inGroup = false;
+            }
         } else {
             $contest_detail=$contestModel->detail($cid);
             $registration=[];
diff --git a/app/Http/Kernel.php b/app/Http/Kernel.php
index 906187cdf..0e4c0f05a 100644
--- a/app/Http/Kernel.php
+++ b/app/Http/Kernel.php
@@ -66,6 +66,7 @@ class Kernel extends HttpKernel
         'group.exist' => \App\Http\Middleware\Group\Exists::class,
         'group.banned' => \App\Http\Middleware\Group\Banned::class,
 
+        'contest.exists' => \App\Http\Middleware\Contest\Exists::class,
         'contest.desktop' => \App\Http\Middleware\Contest\IsDesktop::class,
         'contest.board.admin.pdfview.clearance' => \App\Http\Middleware\Contest\Board\Admin\PDFView\Clearance::class,
 
diff --git a/app/Http/Middleware/Contest/Exists.php b/app/Http/Middleware/Contest/Exists.php
new file mode 100644
index 000000000..9e249037b
--- /dev/null
+++ b/app/Http/Middleware/Contest/Exists.php
@@ -0,0 +1,24 @@
+<?php
+
+namespace App\Http\Middleware\Contest;
+
+use Closure;
+use App\Models\Eloquent\Contest;
+
+class Exists
+{
+    public function handle($request, Closure $next)
+    {
+        $contest = Contest::find($request->cid);
+
+        if(blank($contest)) {
+            return redirect()->route('contest.index');
+        }
+
+        $request->merge([
+            'contestInstance' => $contest
+        ]);
+
+        return $next($request);
+    }
+}
diff --git a/composer.lock b/composer.lock
index 2fca77656..e4ac6117d 100644
--- a/composer.lock
+++ b/composer.lock
@@ -1201,20 +1201,20 @@
         },
         {
             "name": "encore/laravel-admin",
-            "version": "v1.8.14",
+            "version": "v1.8.16",
             "source": {
                 "type": "git",
                 "url": "https://github.com/z-song/laravel-admin.git",
-                "reference": "cb28d1f0f072f9cadb1589ea1a7dcf39e0fae413"
+                "reference": "0f7bafbd2acd4cdb2118c2a6105a6b2aa9dacb13"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/z-song/laravel-admin/zipball/cb28d1f0f072f9cadb1589ea1a7dcf39e0fae413",
-                "reference": "cb28d1f0f072f9cadb1589ea1a7dcf39e0fae413",
+                "url": "https://api.github.com/repos/z-song/laravel-admin/zipball/0f7bafbd2acd4cdb2118c2a6105a6b2aa9dacb13",
+                "reference": "0f7bafbd2acd4cdb2118c2a6105a6b2aa9dacb13",
                 "shasum": ""
             },
             "require": {
-                "doctrine/dbal": "2.*",
+                "doctrine/dbal": "2.*|3.*",
                 "laravel/framework": ">=5.5",
                 "php": ">=7.0.0",
                 "symfony/dom-crawler": "~3.1|~4.0|~5.0"
@@ -1269,9 +1269,9 @@
             ],
             "support": {
                 "issues": "https://github.com/z-song/laravel-admin/issues",
-                "source": "https://github.com/z-song/laravel-admin/tree/v1.8.14"
+                "source": "https://github.com/z-song/laravel-admin/tree/v1.8.16"
             },
-            "time": "2021-09-01T01:15:15+00:00"
+            "time": "2021-11-02T07:52:31+00:00"
         },
         {
             "name": "ezyang/htmlpurifier",
@@ -2999,16 +2999,16 @@
         },
         {
             "name": "laravel/framework",
-            "version": "v8.68.1",
+            "version": "v8.69.0",
             "source": {
                 "type": "git",
                 "url": "https://github.com/laravel/framework.git",
-                "reference": "abe985ff1fb82dd04aab03bc1dc56e83fe61a59f"
+                "reference": "545181da688db64fed6d8427e55f630a90ca0d32"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/laravel/framework/zipball/abe985ff1fb82dd04aab03bc1dc56e83fe61a59f",
-                "reference": "abe985ff1fb82dd04aab03bc1dc56e83fe61a59f",
+                "url": "https://api.github.com/repos/laravel/framework/zipball/545181da688db64fed6d8427e55f630a90ca0d32",
+                "reference": "545181da688db64fed6d8427e55f630a90ca0d32",
                 "shasum": ""
             },
             "require": {
@@ -3167,20 +3167,20 @@
                 "issues": "https://github.com/laravel/framework/issues",
                 "source": "https://github.com/laravel/framework"
             },
-            "time": "2021-10-27T12:31:46+00:00"
+            "time": "2021-11-02T13:53:22+00:00"
         },
         {
             "name": "laravel/passport",
-            "version": "v10.1.4",
+            "version": "v10.2.0",
             "source": {
                 "type": "git",
                 "url": "https://github.com/laravel/passport.git",
-                "reference": "c889d9c464fea409dffe283e9c4e7054ef7aca6f"
+                "reference": "1c69a010930a3ce8db348967d8ad9585be4d7d4d"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/laravel/passport/zipball/c889d9c464fea409dffe283e9c4e7054ef7aca6f",
-                "reference": "c889d9c464fea409dffe283e9c4e7054ef7aca6f",
+                "url": "https://api.github.com/repos/laravel/passport/zipball/1c69a010930a3ce8db348967d8ad9585be4d7d4d",
+                "reference": "1c69a010930a3ce8db348967d8ad9585be4d7d4d",
                 "shasum": ""
             },
             "require": {
@@ -3244,7 +3244,7 @@
                 "issues": "https://github.com/laravel/passport/issues",
                 "source": "https://github.com/laravel/passport"
             },
-            "time": "2021-10-19T15:25:10+00:00"
+            "time": "2021-11-02T16:45:51+00:00"
         },
         {
             "name": "laravel/serializable-closure",
@@ -3444,16 +3444,16 @@
         },
         {
             "name": "laravel/ui",
-            "version": "v3.3.0",
+            "version": "v3.3.1",
             "source": {
                 "type": "git",
                 "url": "https://github.com/laravel/ui.git",
-                "reference": "07d725813350c695c779382cbd6dac0ab8665537"
+                "reference": "a449e3364d9780a80a49894a3af9795c85af806f"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/laravel/ui/zipball/07d725813350c695c779382cbd6dac0ab8665537",
-                "reference": "07d725813350c695c779382cbd6dac0ab8665537",
+                "url": "https://api.github.com/repos/laravel/ui/zipball/a449e3364d9780a80a49894a3af9795c85af806f",
+                "reference": "a449e3364d9780a80a49894a3af9795c85af806f",
                 "shasum": ""
             },
             "require": {
@@ -3496,9 +3496,9 @@
                 "ui"
             ],
             "support": {
-                "source": "https://github.com/laravel/ui/tree/v3.3.0"
+                "source": "https://github.com/laravel/ui/tree/v3.3.1"
             },
-            "time": "2021-05-25T16:45:33+00:00"
+            "time": "2021-11-02T17:04:20+00:00"
         },
         {
             "name": "laravelium/sitemap",
@@ -3642,13 +3642,7 @@
                 "type": "zip",
                 "url": "https://api.github.com/repos/lcobucci/jwt/zipball/55564265fddf810504110bd68ca311932324b0e9",
                 "reference": "55564265fddf810504110bd68ca311932324b0e9",
-                "shasum": "",
-                "mirrors": [
-                    {
-                        "url": "https://mirrors.aliyun.com/composer/dists/%package%/%reference%.%type%",
-                        "preferred": true
-                    }
-                ]
+                "shasum": ""
             },
             "require": {
                 "ext-mbstring": "*",
@@ -6224,16 +6218,16 @@
         },
         {
             "name": "phpseclib/phpseclib",
-            "version": "3.0.10",
+            "version": "3.0.11",
             "source": {
                 "type": "git",
                 "url": "https://github.com/phpseclib/phpseclib.git",
-                "reference": "62fcc5a94ac83b1506f52d7558d828617fac9187"
+                "reference": "6e794226a35159eb06f355efe59a0075a16551dd"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/phpseclib/phpseclib/zipball/62fcc5a94ac83b1506f52d7558d828617fac9187",
-                "reference": "62fcc5a94ac83b1506f52d7558d828617fac9187",
+                "url": "https://api.github.com/repos/phpseclib/phpseclib/zipball/6e794226a35159eb06f355efe59a0075a16551dd",
+                "reference": "6e794226a35159eb06f355efe59a0075a16551dd",
                 "shasum": ""
             },
             "require": {
@@ -6315,7 +6309,7 @@
             ],
             "support": {
                 "issues": "https://github.com/phpseclib/phpseclib/issues",
-                "source": "https://github.com/phpseclib/phpseclib/tree/3.0.10"
+                "source": "https://github.com/phpseclib/phpseclib/tree/3.0.11"
             },
             "funding": [
                 {
@@ -6331,7 +6325,7 @@
                     "type": "tidelift"
                 }
             ],
-            "time": "2021-08-16T04:24:45+00:00"
+            "time": "2021-10-27T03:01:46+00:00"
         },
         {
             "name": "predis/predis",
@@ -7657,16 +7651,16 @@
         },
         {
             "name": "symfony/console",
-            "version": "v5.3.7",
+            "version": "v5.3.10",
             "source": {
                 "type": "git",
                 "url": "https://github.com/symfony/console.git",
-                "reference": "8b1008344647462ae6ec57559da166c2bfa5e16a"
+                "reference": "d4e409d9fbcfbf71af0e5a940abb7b0b4bad0bd3"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/symfony/console/zipball/8b1008344647462ae6ec57559da166c2bfa5e16a",
-                "reference": "8b1008344647462ae6ec57559da166c2bfa5e16a",
+                "url": "https://api.github.com/repos/symfony/console/zipball/d4e409d9fbcfbf71af0e5a940abb7b0b4bad0bd3",
+                "reference": "d4e409d9fbcfbf71af0e5a940abb7b0b4bad0bd3",
                 "shasum": ""
             },
             "require": {
@@ -7736,7 +7730,7 @@
                 "terminal"
             ],
             "support": {
-                "source": "https://github.com/symfony/console/tree/v5.3.7"
+                "source": "https://github.com/symfony/console/tree/v5.3.10"
             },
             "funding": [
                 {
@@ -7752,7 +7746,7 @@
                     "type": "tidelift"
                 }
             ],
-            "time": "2021-08-25T20:02:16+00:00"
+            "time": "2021-10-26T09:30:15+00:00"
         },
         {
             "name": "symfony/css-selector",
@@ -8336,16 +8330,16 @@
         },
         {
             "name": "symfony/http-foundation",
-            "version": "v5.3.7",
+            "version": "v5.3.10",
             "source": {
                 "type": "git",
                 "url": "https://github.com/symfony/http-foundation.git",
-                "reference": "e36c8e5502b4f3f0190c675f1c1f1248a64f04e5"
+                "reference": "9f34f02e8a5fdc7a56bafe011cea1ce97300e54c"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/symfony/http-foundation/zipball/e36c8e5502b4f3f0190c675f1c1f1248a64f04e5",
-                "reference": "e36c8e5502b4f3f0190c675f1c1f1248a64f04e5",
+                "url": "https://api.github.com/repos/symfony/http-foundation/zipball/9f34f02e8a5fdc7a56bafe011cea1ce97300e54c",
+                "reference": "9f34f02e8a5fdc7a56bafe011cea1ce97300e54c",
                 "shasum": ""
             },
             "require": {
@@ -8389,7 +8383,7 @@
             "description": "Defines an object-oriented layer for the HTTP specification",
             "homepage": "https://symfony.com",
             "support": {
-                "source": "https://github.com/symfony/http-foundation/tree/v5.3.7"
+                "source": "https://github.com/symfony/http-foundation/tree/v5.3.10"
             },
             "funding": [
                 {
@@ -8405,20 +8399,20 @@
                     "type": "tidelift"
                 }
             ],
-            "time": "2021-08-27T11:20:35+00:00"
+            "time": "2021-10-11T15:41:55+00:00"
         },
         {
             "name": "symfony/http-kernel",
-            "version": "v5.3.9",
+            "version": "v5.3.10",
             "source": {
                 "type": "git",
                 "url": "https://github.com/symfony/http-kernel.git",
-                "reference": "ceaf46a992f60e90645e7279825a830f733a17c5"
+                "reference": "703e4079920468e9522b72cf47fd76ce8d795e86"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/symfony/http-kernel/zipball/ceaf46a992f60e90645e7279825a830f733a17c5",
-                "reference": "ceaf46a992f60e90645e7279825a830f733a17c5",
+                "url": "https://api.github.com/repos/symfony/http-kernel/zipball/703e4079920468e9522b72cf47fd76ce8d795e86",
+                "reference": "703e4079920468e9522b72cf47fd76ce8d795e86",
                 "shasum": ""
             },
             "require": {
@@ -8501,7 +8495,7 @@
             "description": "Provides a structured process for converting a Request into a Response",
             "homepage": "https://symfony.com",
             "support": {
-                "source": "https://github.com/symfony/http-kernel/tree/v5.3.9"
+                "source": "https://github.com/symfony/http-kernel/tree/v5.3.10"
             },
             "funding": [
                 {
@@ -8517,7 +8511,7 @@
                     "type": "tidelift"
                 }
             ],
-            "time": "2021-09-28T10:25:11+00:00"
+            "time": "2021-10-29T08:36:48+00:00"
         },
         {
             "name": "symfony/mime",
@@ -9731,16 +9725,16 @@
         },
         {
             "name": "symfony/string",
-            "version": "v5.3.7",
+            "version": "v5.3.10",
             "source": {
                 "type": "git",
                 "url": "https://github.com/symfony/string.git",
-                "reference": "8d224396e28d30f81969f083a58763b8b9ceb0a5"
+                "reference": "d70c35bb20bbca71fc4ab7921e3c6bda1a82a60c"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/symfony/string/zipball/8d224396e28d30f81969f083a58763b8b9ceb0a5",
-                "reference": "8d224396e28d30f81969f083a58763b8b9ceb0a5",
+                "url": "https://api.github.com/repos/symfony/string/zipball/d70c35bb20bbca71fc4ab7921e3c6bda1a82a60c",
+                "reference": "d70c35bb20bbca71fc4ab7921e3c6bda1a82a60c",
                 "shasum": ""
             },
             "require": {
@@ -9794,7 +9788,7 @@
                 "utf8"
             ],
             "support": {
-                "source": "https://github.com/symfony/string/tree/v5.3.7"
+                "source": "https://github.com/symfony/string/tree/v5.3.10"
             },
             "funding": [
                 {
@@ -9810,20 +9804,20 @@
                     "type": "tidelift"
                 }
             ],
-            "time": "2021-08-26T08:00:08+00:00"
+            "time": "2021-10-27T18:21:46+00:00"
         },
         {
             "name": "symfony/translation",
-            "version": "v5.3.9",
+            "version": "v5.3.10",
             "source": {
                 "type": "git",
                 "url": "https://github.com/symfony/translation.git",
-                "reference": "6e69f3551c1a3356cf6ea8d019bf039a0f8b6886"
+                "reference": "6ef197aea2ac8b9cd63e0da7522b3771714035aa"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/symfony/translation/zipball/6e69f3551c1a3356cf6ea8d019bf039a0f8b6886",
-                "reference": "6e69f3551c1a3356cf6ea8d019bf039a0f8b6886",
+                "url": "https://api.github.com/repos/symfony/translation/zipball/6ef197aea2ac8b9cd63e0da7522b3771714035aa",
+                "reference": "6ef197aea2ac8b9cd63e0da7522b3771714035aa",
                 "shasum": ""
             },
             "require": {
@@ -9889,7 +9883,7 @@
             "description": "Provides tools to internationalize your application",
             "homepage": "https://symfony.com",
             "support": {
-                "source": "https://github.com/symfony/translation/tree/v5.3.9"
+                "source": "https://github.com/symfony/translation/tree/v5.3.10"
             },
             "funding": [
                 {
@@ -9905,7 +9899,7 @@
                     "type": "tidelift"
                 }
             ],
-            "time": "2021-08-26T08:22:53+00:00"
+            "time": "2021-10-10T06:43:24+00:00"
         },
         {
             "name": "symfony/translation-contracts",
@@ -9987,16 +9981,16 @@
         },
         {
             "name": "symfony/var-dumper",
-            "version": "v5.3.8",
+            "version": "v5.3.10",
             "source": {
                 "type": "git",
                 "url": "https://github.com/symfony/var-dumper.git",
-                "reference": "eaaea4098be1c90c8285543e1356a09c8aa5c8da"
+                "reference": "875432adb5f5570fff21036fd22aee244636b7d1"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/symfony/var-dumper/zipball/eaaea4098be1c90c8285543e1356a09c8aa5c8da",
-                "reference": "eaaea4098be1c90c8285543e1356a09c8aa5c8da",
+                "url": "https://api.github.com/repos/symfony/var-dumper/zipball/875432adb5f5570fff21036fd22aee244636b7d1",
+                "reference": "875432adb5f5570fff21036fd22aee244636b7d1",
                 "shasum": ""
             },
             "require": {
@@ -10055,7 +10049,7 @@
                 "dump"
             ],
             "support": {
-                "source": "https://github.com/symfony/var-dumper/tree/v5.3.8"
+                "source": "https://github.com/symfony/var-dumper/tree/v5.3.10"
             },
             "funding": [
                 {
@@ -10071,7 +10065,7 @@
                     "type": "tidelift"
                 }
             ],
-            "time": "2021-09-24T15:59:58+00:00"
+            "time": "2021-10-26T09:30:15+00:00"
         },
         {
             "name": "tijsverkoyen/css-to-inline-styles",
diff --git a/config/version.php b/config/version.php
index 344e3f9d7..02ab6af1a 100644
--- a/config/version.php
+++ b/config/version.php
@@ -14,7 +14,7 @@
     'number' => [
         'major' => 0,
         'minor' => 17,
-        'build' => 3,
+        'build' => 4,
     ],
 
     /*
@@ -37,7 +37,7 @@
     |
     */
 
-    'build' => 'Build Pack 3',
+    'build' => 'Build Pack 4',
 
     /*
     |--------------------------------------------------------------------------
diff --git a/package-lock.json b/package-lock.json
index bd39c460b..81b448a37 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -4582,6 +4582,11 @@
             "integrity": "sha1-omLY7vZ6ztV8KFKtYWdSakPL97c=",
             "dev": true
         },
+        "github-markdown-css": {
+            "version": "5.0.0",
+            "resolved": "https://registry.npmmirror.com/github-markdown-css/download/github-markdown-css-5.0.0.tgz?cache=0&sync_timestamp=1634473559070&other_urls=https%3A%2F%2Fregistry.npmmirror.com%2Fgithub-markdown-css%2Fdownload%2Fgithub-markdown-css-5.0.0.tgz",
+            "integrity": "sha1-gplmknZDQm8KQ6q+6ZkaPtUyKA0="
+        },
         "glob": {
             "version": "7.2.0",
             "resolved": "https://registry.npmmirror.com/glob/download/glob-7.2.0.tgz",
diff --git a/package.json b/package.json
index bb602dc3a..cf88429a4 100644
--- a/package.json
+++ b/package.json
@@ -32,6 +32,7 @@
         "clipboard": "^2.0",
         "codemirror": "^5.58",
         "dompurify": "^2.0",
+        "github-markdown-css": "^5.0.0",
         "highlight.js": "^11.2.0",
         "ignore-emit-webpack-plugin": "^2.0.6",
         "ignore-loader": "^0.1.2",
diff --git a/resources/views/message/detail.blade.php b/resources/views/message/detail.blade.php
index f14bc95cf..d4b15388e 100644
--- a/resources/views/message/detail.blade.php
+++ b/resources/views/message/detail.blade.php
@@ -19,40 +19,34 @@
         box-shadow: rgba(0, 0, 0, 0.15) 0px 0px 40px;
     }
 
-    paper-card > div.sender{
+    paper-card > div.sender {
         display: flex;
         justify-content: flex-start;
         align-items: center;
         color: rgba(0, 0, 0, 0.62);
     }
 
-    .sender_name{
+    .sender_name {
         font-weight: bolder;
         margin: 0;
     }
 
-    div.content img{
-        max-width: calc(100% - 4rem);
-    }
-
-    h5.msg-title  {
+    h5.msg-title {
         font-weight: bold;
         font-family: 'Roboto Slab';
         margin-bottom: 1rem;
         color: #000;
     }
 
-    div.content p{
-        word-wrap:break-word;
-        word-break:break-all;
-        text-indent: 2rem;
-    }
-
-    .cm-avatar{
+    .cm-avatar {
         width:2.5rem;
         height:2.5rem;
         border-radius: 2000px;
     }
+
+    .message-container {
+        padding: 1rem;
+    }
 </style>
 <div class="container mundb-standard-container">
     <paper-card>
@@ -65,8 +59,10 @@
             </div>
         </div>
         <hr>
-        <div class="content">
-            <p>{!! clean(convertMarkdownToHtml($message->content)) !!}</p>
+        <div class="message-container">
+            <div class="markdown-body">
+                <p>{!! clean(convertMarkdownToHtml($message->content)) !!}</p>
+            </div>
         </div>
         {{-- @if($message['allow_reply'])
             <hr>
diff --git a/routes/web.php b/routes/web.php
index 49191979e..8137c1f9f 100644
--- a/routes/web.php
+++ b/routes/web.php
@@ -94,36 +94,39 @@
     });
 });
 
-Route::group([
-    'namespace' => 'Contest',
-    'prefix' => 'contest',
-    'as' => 'contest.',
-    'middleware' => [
-        'contest_account',
-        'user.banned'
-    ]
-], function () {
+Route::group([ 'namespace' => 'Contest', 'prefix' => 'contest', 'as' => 'contest.', 'middleware' => [ 'contest_account', 'user.banned' ] ], function () {
+
     Route::get('/', 'IndexController@index')->name('index');
-    Route::get('/{cid}', 'IndexController@detail')->name('detail');
-
-    Route::group(['as' => 'board.'], function () {
-        Route::group(['middleware' => ['contest.desktop']], function () {
-            Route::get('/{cid}/board', 'BoardController@board')->middleware('auth')->name('index');
-            Route::get('/{cid}/board/challenge', 'BoardController@challenge')->middleware('auth')->name('challenge');
-            Route::get('/{cid}/board/challenge/{ncode}', 'BoardController@editor')->middleware('auth')->name('editor');
-            Route::get('/{cid}/board/rank', 'BoardController@rank')->middleware('auth')->name('rank');
-            Route::get('/{cid}/board/status', 'BoardController@status')->middleware('auth')->name('status');
-            Route::get('/{cid}/board/clarification', 'BoardController@clarification')->middleware('auth')->name('clarification');
-            Route::get('/{cid}/board/print', 'BoardController@print')->middleware('auth')->name('print');
-            Route::get('/{cid}/board/analysis', 'BoardController@analysis')->middleware('auth')->name('analysis');
+
+    Route::group(['prefix' => '{cid}', 'middleware' => ['contest.exists']], function () {
+
+        Route::get('/', 'IndexController@detail')->name('detail');
+
+        Route::group(['as' => 'board.', 'prefix' => 'board', 'middleware' => ['auth']], function () {
+
+            Route::group(['middleware' => ['contest.desktop']], function () {
+                Route::get('/', 'BoardController@board')->name('index');
+                Route::get('/challenge', 'BoardController@challenge')->name('challenge');
+                Route::get('/challenge/{ncode}', 'BoardController@editor')->name('editor');
+                Route::get('/rank', 'BoardController@rank')->name('rank');
+                Route::get('/status', 'BoardController@status')->name('status');
+                Route::get('/clarification', 'BoardController@clarification')->name('clarification');
+                Route::get('/print', 'BoardController@print')->name('print');
+                Route::get('/analysis', 'BoardController@analysis')->name('analysis');
+            });
+
+            Route::group(['prefix' => 'admin'], function () {
+                Route::get('/', 'AdminController@admin')->middleware(['privileged'])->name('admin');
+                Route::get('/scrollBoard', 'AdminController@scrollBoard')->middleware(['contest_account', 'privileged'])->name('admin.scrollboard');
+                Route::get('/downloadContestAccountXlsx', 'AdminController@downloadContestAccountXlsx')->name('admin.download.contestaccountxlsx');
+                Route::get('/refreshContestRank', 'AdminController@refreshContestRank')->name('admin.refresh.contestrank');
+                Route::get('/pdfView', 'AdminController@pdfView')->middleware(['contest.board.admin.pdfview.clearance'])->name('admin.pdf.view');
+            });
+
         });
 
-        Route::get('/{cid}/board/admin', 'AdminController@admin')->middleware('auth', 'privileged')->name('admin');
-        Route::get('/{cid}/board/admin/scrollBoard', 'AdminController@scrollBoard')->middleware('auth', 'contest_account', 'privileged')->name('admin.scrollboard');
-        Route::get('/{cid}/board/admin/downloadContestAccountXlsx', 'AdminController@downloadContestAccountXlsx')->middleware('auth')->name('admin.download.contestaccountxlsx');
-        Route::get('/{cid}/board/admin/refreshContestRank', 'AdminController@refreshContestRank')->middleware('auth')->name('admin.refresh.contestrank');
-        Route::get('/{cid}/board/admin/pdfView', 'AdminController@pdfView')->middleware('contest.board.admin.pdfview.clearance')->name('admin.pdf.view');
     });
+
 });
 
 Route::group(['prefix' => 'system', 'middleware' => ['user.banned']], function () {
diff --git a/webpack.mix.js b/webpack.mix.js
index 35beeba5c..b155132d2 100644
--- a/webpack.mix.js
+++ b/webpack.mix.js
@@ -32,6 +32,7 @@ mix.styles([
     'node_modules/codemirror/lib/codemirror.css',
     'node_modules/codemirror/addon/hint/show-hint.css',
     'node_modules/highlight.js/styles/vs.css',
+    'node_modules/github-markdown-css/github-markdown-light.css',
 ], 'public/static/css/build/app.admin.css');
 
 // Compile NOJ Admin Portal JS Libraries Bundle - app.admin.js
@@ -71,6 +72,7 @@ mix.styles([
     'resources/css/main.css',
     'node_modules/jquery-datetimepicker/build/jquery.datetimepicker.min.css',
     'node_modules/simplemde/dist/simplemde.min.css',
+    'node_modules/github-markdown-css/github-markdown-light.css',
 ], 'public/static/css/build/app.css');
 
 // Compile NOJ Editor - app.editor.js