diff --git a/web/app/models/HTML.php b/web/app/models/HTML.php
index 89bc8b6..f037f09 100644
--- a/web/app/models/HTML.php
+++ b/web/app/models/HTML.php
@@ -193,7 +193,7 @@ class HTML {
 	}
 
 	public static function parsedown() {
-		return new ParsedownMath([
+		return new UOJMarkdown([
 			'math' => [
 				'enabled' => true,
 				'matchSingleDollar' => true
diff --git a/web/app/models/UOJBlogEditor.php b/web/app/models/UOJBlogEditor.php
index 6654b03..9178c99 100644
--- a/web/app/models/UOJBlogEditor.php
+++ b/web/app/models/UOJBlogEditor.php
@@ -108,15 +108,7 @@ class UOJBlogEditor {
 		
 		if ($this->show_editor) {
 			if ($this->type == 'blog') {
-				$content_md = $_POST[$this->name . '_content_md'];
-				$dom = new DOMDocument;
-				$dom->loadHTML(mb_convert_encoding($parsedown->text($this->post_data['content_md']), 'HTML-ENTITIES', 'UTF-8'));
-				$elements = $dom->getElementsByTagName('table');
-				foreach ($elements as $element) {
-					$element->setAttribute('class',
-						$element->getAttribute('class') . ' table table-bordered');
-				}
-				$this->post_data['content'] = $dom->saveHTML();
+				$this->post_data['content'] = $parsedown->text($this->post_data['content_md']);
 
 				if (preg_match('/^.*<!--.*readmore.*-->.*$/m', $this->post_data['content'], $matches, PREG_OFFSET_CAPTURE)) {
 					$content_less = substr($this->post_data['content'], 0, $matches[0][1]);
diff --git a/web/app/models/UOJMarkdown.php b/web/app/models/UOJMarkdown.php
new file mode 100644
index 0000000..b813f66
--- /dev/null
+++ b/web/app/models/UOJMarkdown.php
@@ -0,0 +1,78 @@
+<?php
+class UOJMarkdown extends ParsedownMath {
+	public function __construct($options = '') {
+		if (method_exists(get_parent_class(),"__construct")) {
+			parent::__construct($options);
+		}
+
+		// https://gist.github.com/ShNURoK42/b5ce8baa570975db487c
+		$this->InlineTypes['@'][] = 'UserMention';
+		$this->inlineMarkerList .= '@';
+	}
+
+	// https://github.com/taufik-nurrohman/parsedown-extra-plugin/blob/1653418c5a9cf5277cd28b0b23ba2d95d18e9bc4/ParsedownExtraPlugin.php#L340-L345
+	protected function doGetAttributes($Element) {
+		if (isset($Element['attributes'])) {
+			return (array) $Element['attributes'];
+		}
+		return array();
+	}
+
+	// https://github.com/taufik-nurrohman/parsedown-extra-plugin/blob/1653418c5a9cf5277cd28b0b23ba2d95d18e9bc4/ParsedownExtraPlugin.php#L347-L358
+    protected function doGetContent($Element) {
+        if (isset($Element['text'])) {
+            return $Element['text'];
+        }
+        if (isset($Element['rawHtml'])) {
+            return $Element['rawHtml'];
+        }
+        if (isset($Element['handler']['argument'])) {
+            return implode("\n", (array) $Element['handler']['argument']);
+        }
+        return null;
+    }
+
+	// https://github.com/taufik-nurrohman/parsedown-extra-plugin/blob/1653418c5a9cf5277cd28b0b23ba2d95d18e9bc4/ParsedownExtraPlugin.php#L369-L378
+	protected function doSetAttributes(&$Element, $From, $Args = array()) {
+		$Attributes = $this->doGetAttributes($Element);
+		$Content = $this->doGetContent($Element);
+		if (is_callable($From)) {
+			$Args = array_merge(array($Content, $Attributes, &$Element), $Args);
+			$Element['attributes'] = array_replace($Attributes, (array) call_user_func_array($From, $Args));
+		} else {
+			$Element['attributes'] = array_replace($Attributes, (array) $From);
+		}
+	}
+
+	// Add classes to <table>
+	protected function blockTableComplete($Block) {
+		$this->doSetAttributes($Block['element'], ['class' => 'table table-bordered']);
+
+		return $Block;
+	}
+
+	// https://gist.github.com/ShNURoK42/b5ce8baa570975db487c
+    protected function inlineUserMention($Excerpt) {
+    	if (preg_match('/^@([^\s]+)/', $Excerpt['text'], $matches)) {
+			if (validateUsername($matches[1]) && ($user = queryUser($matches[1]))) {
+				return [
+					'extent' => strlen($matches[0]),
+					'element' => [
+						'name' => 'a',
+						'text' => '@' . $user['username'],
+						'attributes' => [
+							'href' => '/user/' . $user['username'],
+							'class' => 'uoj-username',
+							'data-realname' => $user['realname'],
+						],
+					],
+				];
+			}
+
+			return [
+				'extent' => strlen($matches[0]),
+				'markup' => $matches[0],
+			];
+    	}
+    }
+}