diff --git a/common.php b/common.php
index 5ba0419cc..f8ddc31c1 100644
--- a/common.php
+++ b/common.php
@@ -123,6 +123,8 @@ $board  = array();
 $group  = array();
 $g5     = array();
 
+include_once(G5_LIB_PATH.'/hook.lib.php');    // hook 함수 파일
+include_once(G5_LIB_PATH.'/uri.lib.php');    // URL 함수 파일
 
 //==============================================================================
 // 공통
@@ -637,5 +639,7 @@ header('Cache-Control: no-store, no-cache, must-revalidate'); // HTTP/1.1
 header('Cache-Control: pre-check=0, post-check=0, max-age=0'); // HTTP/1.1
 header('Pragma: no-cache'); // HTTP/1.0
 
+start_event('common_header');
+
 $html_process = new html_process();
-?>
\ No newline at end of file
+?>
diff --git a/lib/Hook/hook.class.php b/lib/Hook/hook.class.php
new file mode 100644
index 000000000..70452b041
--- /dev/null
+++ b/lib/Hook/hook.class.php
@@ -0,0 +1,327 @@
+<?php
+if (!defined('_GNUBOARD_')) exit;
+
+/**
+ * Library for handling hooks.
+ *
+ * @author    Josantonius <hello@josantonius.com>
+ * @copyright 2017 (c) Josantonius - PHP-Hook
+ * @license   https://opensource.org/licenses/MIT - The MIT License (MIT)
+ * @link      https://github.com/Josantonius/PHP-Hook
+ * @since     1.0.0
+ */
+
+/**
+ * Hook handler.
+ *
+ * @since 1.0.0
+ */
+class Hook
+{
+    /**
+     * Instance id.
+     *
+     * @since 1.0.5
+     *
+     * @var int
+     */
+    protected static $id = '0';
+
+    /**
+     * Callbacks.
+     *
+     * @since 1.0.3
+     *
+     * @var array
+     */
+    protected $callbacks = array();
+
+    /**
+     * Number of actions executed.
+     *
+     * @since 1.0.3
+     *
+     * @var array
+     */
+    protected $actions = array('count' => 0);
+
+    /**
+     * Current action hook.
+     *
+     * @since 1.0.3
+     *
+     * @var string|false
+     */
+    protected static $current = false;
+
+    /**
+     * Method to use the singleton pattern and just create an instance.
+     *
+     * @since 1.0.0
+     *
+     * @var string
+     */
+    protected $singleton = 'getInstance';
+
+    /**
+     * Instances.
+     *
+     * @since 1.0.0
+     *
+     * @var array
+     */
+    private static $instances = array();
+
+    /**
+     * Get instance.
+     *
+     * @since 1.0.0
+     *
+     * @param int $id
+     *
+     * @return object → instance
+     */
+    // 이부분 수정
+    /*
+    public static function getInstance($id = '0')
+    {
+        self::$id = $id;
+        if (isset(self::$instances[self::$id])) {
+            return self::$instances[self::$id];
+        }
+
+        return self::$instances[self::$id] = new self;
+    }
+    */
+
+    public static function getInstance($id = '0')
+    {
+        self::$id = $id;
+        if (isset(self::$instances[self::$id])) {
+            return self::$instances[self::$id];
+        }
+
+        $calledClass = get_called_class();
+
+        return self::$instances[self::$id] = new $calledClass;
+    }
+
+    /**
+     * Attach custom function to action hook.
+     *
+     * @since 1.0.3
+     *
+     * @param string   $tag      → action hook name
+     * @param callable $func     → function to attach to action hook
+     * @param int      $priority → order in which the action is executed
+     * @param int      $args     → number of arguments accepted
+     *
+     * @return bool
+     */
+    public static function addAction($tag, $func, $priority = 8, $args = 0)
+    {
+        $that = self::getInstance(self::$id);
+
+        $that->callbacks[$tag][$priority][] = array(
+            'function' => $func,
+            'arguments' => $args,
+        );
+
+        return true;
+    }
+
+    /**
+     * Add actions hooks from array.
+     *
+     * @since 1.0.3
+     *
+     * @param array $actions
+     *
+     * @return bool
+     */
+    public static function addActions($actions)
+    {
+        foreach ($actions as $arguments) {
+            call_user_func_array(array(__CLASS__, 'addAction'), $arguments);
+        }
+
+        return true;
+    }
+
+    /**
+     * Run all hooks attached to the hook.
+     *
+     * By default it will look for getInstance method to use singleton
+     * pattern and create a single instance of the class. If it does not
+     * exist it will create a new object.
+     *
+     * @see setSingletonName() for change the method name.
+     *
+     * @since 1.0.3
+     *
+     * @param string $tag    → action hook name
+     * @param mixed  $args   → optional arguments
+     * @param bool   $remove → delete hook after executing actions
+     *
+     * @return returns the output of the last action or false
+     */
+    public static function doAction($tag, $args = array(), $remove = true)
+    {
+        $that = self::getInstance(self::$id);
+        
+        self::$current = $tag;
+
+        $that->actions['count']++;
+
+        if (! array_key_exists($tag, $that->actions)) {
+            $that->actions[$tag] = 0;
+        }
+
+        $that->actions[$tag]++;
+        $actions = $that->getActions($tag, $remove);
+        //asort($actions);
+        // 이 부분 수정 priority 로 정렬 하려면 ksort를 써야함
+        ksort($actions);
+
+        foreach ($actions as $priority) {
+            foreach ($priority as $action) {
+                $action = $that->runAction($action, $args);
+            }
+        }
+
+        self::$current = false;
+
+        return (isset($action)) ? $action : false;
+    }
+
+    /**
+     * Set method name for use singleton pattern.
+     *
+     * @since 1.0.0
+     *
+     * @param string $method → singleton method name
+     */
+    public static function setSingletonName($method)
+    {
+        $that = self::getInstance(self::$id);
+
+        $that->singleton = $method;
+    }
+
+    /**
+     * Returns the current action hook.
+     *
+     * @since 1.0.3
+     *
+     * @return string|false → current action hook
+     */
+    public static function current()
+    {
+        return self::$current;
+    }
+
+    /**
+     * Check if there is a certain action hook.
+     *
+     * @since 1.0.7
+     *
+     * @param string $tag → action hook name
+     *
+     * @return bool
+     */
+    public static function isAction($tag)
+    {
+        $that = self::getInstance(self::$id);
+
+        return isset($that->callbacks[$tag]);
+    }
+
+    /**
+     * Run action hook.
+     *
+     * @since 1.0.3
+     *
+     * @param string $action → action hook
+     * @param int    $args   → arguments
+     *
+     * @return callable|false → returns the calling function
+     */
+    protected function runAction($action, $args)
+    {
+        $function = $action['function'];
+        $argsNumber = $action['arguments'];
+
+        $class = (isset($function[0])) ? $function[0] : false;
+        $method = (isset($function[1])) ? $function[1] : false;
+
+        $args = $this->getArguments($argsNumber, $args);
+
+        if (! ($class && $method) && function_exists($function)) {
+            return call_user_func($function, $args);
+        } elseif ($obj = call_user_func(array($class, $this->singleton))) {
+            if ($obj !== false) {
+                return call_user_func_array(array($obj, $method), $args);
+            }
+        } elseif (class_exists($class)) {
+            $instance = new $class;
+
+            return call_user_func_array(array($instance, $method), $args);
+        }
+
+        return null;
+    }
+
+    /**
+     * Get actions for hook
+     *
+     * @since 1.0.3
+     *
+     * @param string $tag    → action hook name
+     * @param bool   $remove → delete hook after executing actions
+     *
+     * @return object|false → returns the calling function
+     */
+    protected function getActions($tag, $remove)
+    {
+        if (isset($this->callbacks[$tag])) {
+            $actions = $this->callbacks[$tag];
+            if ($remove) {
+                unset($this->callbacks[$tag]);
+            }
+        }
+
+        return (isset($actions)) ? $actions : array();
+    }
+
+    /**
+     * Get arguments for action.
+     *
+     * @since 1.0.3
+     *
+     * @param int   $argsNumber → arguments number
+     * @param mixed $arguments  → arguments
+     *
+     * @return array → arguments
+     */
+    protected function getArguments($argsNumber, $arguments)
+    {
+        if ($argsNumber == 1 && is_string($arguments)) {
+            return array($arguments);
+        } elseif ($argsNumber === count($arguments)) {
+            return $arguments;
+        }
+
+        for ($i = 0; $i < $argsNumber; $i++) {
+            if (array_key_exists($i, $arguments)) {
+                $args[] = $arguments[$i];
+                continue;
+            }
+
+            return $args;
+        }
+
+        return array();
+    }
+}
+
+?>
\ No newline at end of file
diff --git a/lib/Hook/hook.extends.class.php b/lib/Hook/hook.extends.class.php
new file mode 100644
index 000000000..fd8b7cb82
--- /dev/null
+++ b/lib/Hook/hook.extends.class.php
@@ -0,0 +1,161 @@
+<?php
+if (!defined('_GNUBOARD_')) exit;
+
+Class GML_Hook extends Hook {
+    
+    protected $filters = array('count' => 0);
+    
+    protected $callback_filters = array();
+    
+    protected static $current_filter = false;
+
+    protected function runAction($action, $args)
+    {
+        $function = $action['function'];
+        $argsNumber = $action['arguments'];
+
+        $class = (is_array($function) && isset($function[0])) ? $function[0] : false;
+        $method = (is_array($function) && isset($function[1])) ? $function[1] : false;
+
+        $args = $this->getArguments($argsNumber, $args);
+
+        if (! ($class && $method) && function_exists($function)) {
+            return call_user_func_array($function, $args);
+        } elseif ($obj = call_user_func(array($class, $this->singleton))) {
+            if ($obj !== false) {
+                return call_user_func_array(array($obj, $method), $args);
+            }
+        } elseif (class_exists($class)) {
+            $instance = new $class;
+
+            return call_user_func_array(array($instance, $method), $args);
+        }
+    }
+
+    protected function getFilters($tag, $remove)
+    {
+        if (isset($this->callback_filters[$tag])) {
+            $filters = $this->callback_filters[$tag];
+            if ($remove) {
+                unset($this->callback_filters[$tag]);
+            }
+        }
+
+        return (isset($filters)) ? $filters : array();
+    }
+
+    public static function get_properties($type, $is_callback=false){
+
+        $that = self::getInstance(self::$id);
+
+        if( $type === 'event' ){
+            return $is_callback ? $that->callbacks : $that->actions;
+        }
+
+        return $is_callback ? $that->callback_filters : $that->filters;
+    }
+
+    public static function addFilter($tag, $func, $priority = 8, $args = 0)
+    {
+        $that = self::getInstance(self::$id);
+
+        $that->callback_filters[$tag][$priority][] = array(
+            'function' => $func,
+            'arguments' => $args,
+        );
+
+        return true;
+    }
+
+    public static function apply_filters($tag, $args = array(), $remove = true)
+    {
+        $that = self::getInstance(self::$id);
+
+        self::$current_filter = $tag;
+
+        $that->filters['count']++;
+
+        if (! array_key_exists($tag, $that->filters)) {
+            $that->filters[$tag] = 0;
+        }
+
+        $that->filters[$tag]++;
+        $filters = $that->getFilters($tag, $remove);
+        ksort($filters);
+
+        $value = $args[0];
+
+        foreach ($filters as $priority) {
+            foreach ($priority as $filter) {
+                $replace = $that->runAction($filter, $args);
+
+                if( ! is_null($replace) ) {
+                    $value = $replace;
+                }
+            }
+        }
+
+        self::$current_filter = false;
+
+        return $value;
+    }
+
+    protected function getArguments($argsNumber, $arguments)
+    {
+        if ($argsNumber == 1 && is_string($arguments)) {
+            return array($arguments);
+        } elseif ($argsNumber === count($arguments)) {
+            return $arguments;
+        }
+
+        $args = array();
+
+        for ($i = 0; $i < $argsNumber; $i++) {
+            if (is_array($arguments) && array_key_exists($i, $arguments)) {
+                $args[] = $arguments[$i];
+            }
+        }
+
+        return $args;
+    }
+
+    public static function remove_filter($tag, $func, $priority)
+    {
+        $that = self::getInstance(self::$id);
+
+        $is_remove = false;
+
+        if (isset($that->callback_filters[$tag]) && isset($that->callback_filters[$tag][$priority]) ) {
+            
+            $found_key = array_search($func, array_column($that->callback_filters[$tag][$priority], 'function'));
+
+            if( $found_key !== false ){
+                unset($that->callback_filters[$tag][$priority][$found_key]);
+            }
+        }
+
+        return $is_remove;
+    }
+
+    public static function remove_action($tag, $func, $priority)
+    {
+        $that = self::getInstance(self::$id);
+
+        $is_remove = false;
+
+        if (isset($that->callbacks[$tag]) && isset($that->callbacks[$tag][$priority]) ) {
+            
+            $found_key = array_search($func, array_column($that->callbacks[$tag][$priority], 'function'));
+
+            if( $found_key !== false ){
+                unset($that->callbacks[$tag][$priority][$found_key]);
+            }
+        }
+
+        return $is_remove;
+    }
+}
+
+// end  Hook Class
+
+?>
\ No newline at end of file
diff --git a/lib/URI/uri.class.php b/lib/URI/uri.class.php
new file mode 100644
index 000000000..2f650e45b
--- /dev/null
+++ b/lib/URI/uri.class.php
@@ -0,0 +1,7 @@
+<?php
+if (!defined('_GNUBOARD_')) exit;
+
+class G5_URI {
+
+}
+?>
\ No newline at end of file
diff --git a/lib/common.lib.php b/lib/common.lib.php
index 963701e47..ba5fd126e 100644
--- a/lib/common.lib.php
+++ b/lib/common.lib.php
@@ -405,9 +405,9 @@ function get_list($write_row, $board, $skin_url, $subject_len=40)
         $list['icon_link'] = '<i class="fa fa-link" aria-hidden="true"></i> ';
 
     // 분류명 링크
-    $list['ca_name_href'] = G5_BBS_URL.'/board.php?bo_table='.$board['bo_table'].'&amp;sca='.urlencode($list['ca_name']);
+    $list['ca_name_href'] = get_pretty_url($board['bo_table'], '', 'sca='.urlencode($list['ca_name']));
 
-    $list['href'] = G5_BBS_URL.'/board.php?bo_table='.$board['bo_table'].'&amp;wr_id='.$list['wr_id'].$qstr;
+    $list['href'] = get_pretty_url($board['bo_table'], $list['wr_id'], $qstr);
     $list['comment_href'] = $list['href'];
 
     $list['icon_new'] = '';
diff --git a/lib/hook.lib.php b/lib/hook.lib.php
new file mode 100644
index 000000000..3739fbcc3
--- /dev/null
+++ b/lib/hook.lib.php
@@ -0,0 +1,125 @@
+<?php
+if (!defined('_GNUBOARD_')) exit;
+
+define('G5_HOOK_DEFAULT_PRIORITY', 8);
+
+include_once(dirname(__FILE__) .'/Hook/hook.class.php');
+include_once(dirname(__FILE__) .'/Hook/hook.extends.class.php');
+
+function get_hook_class(){
+
+    if( class_exists('GML_Hook') ){
+        return GML_Hook::getInstance();
+    }
+
+    return null;
+}
+
+function put_event($tag, $func, $priority=GML_HOOK_DEFAULT_PRIORITY, $args=0){
+    global $gml;
+
+    if( $hook = get_hook_class() ){
+        $hook::addAction($tag, $func, $priority, $args);
+    }
+}
+
+function start_event($tag, $arg = ''){
+    global $gml;
+
+    if( $hook = get_hook_class() ){
+
+        $args = array();
+
+        if (
+            is_array($arg)
+            &&
+            isset($arg[0])
+            &&
+            is_object($arg[0])
+            &&
+            1 == count($arg)
+        ) {
+          $args[] =& $arg[0];
+        } else {
+          $args[] = $arg;
+        }
+
+        $numArgs = func_num_args();
+
+        for ($a = 2; $a < $numArgs; $a++) {
+          $args[] = func_get_arg($a);
+        }
+
+        $hook::doAction($tag, $args, false);
+    }
+}
+
+function put_replace($tag, $func, $priority=G5_HOOK_DEFAULT_PRIORITY, $args=0){
+    global $gml;
+
+    if( $hook = get_hook_class() ){
+        return $hook::addFilter($tag, $func, $priority, $args);
+    }
+
+    return null;
+}
+
+function apply_replace($tag, $arg = ''){
+    global $gml;
+
+    if( $hook = get_hook_class() ){
+
+        $args = array();
+
+        if (
+            is_array($arg)
+            &&
+            isset($arg[0])
+            &&
+            is_object($arg[0])
+            &&
+            1 == count($arg)
+        ) {
+          $args[] =& $arg[0];
+        } else {
+          $args[] = $arg;
+        }
+
+        $numArgs = func_num_args();
+
+        for ($a = 2; $a < $numArgs; $a++) {
+          $args[] = func_get_arg($a);
+        }
+
+        return $hook::apply_filters($tag, $args, false);
+    }
+
+    return null;
+}
+
+function delete_event($tag, $func, $priority=G5_HOOK_DEFAULT_PRIORITY){
+
+    if( $hook = get_hook_class() ){
+        return $hook::remove_action($tag, $func, $priority);
+    }
+
+    return null;
+}
+
+function delete_replace($tag, $func, $priority=G5_HOOK_DEFAULT_PRIORITY){
+
+    if( $hook = get_hook_class() ){
+        return $hook::remove_filter($tag, $func, $priority);
+    }
+
+    return null;
+}
+
+function get_hook_datas($type='', $is_callback=''){
+    if( $hook = get_hook_class() ){
+        return $hook::get_properties($type, $is_callback);
+    }
+
+    return null;
+}
+?>
\ No newline at end of file
diff --git a/lib/uri.lib.php b/lib/uri.lib.php
new file mode 100644
index 000000000..ec02dad09
--- /dev/null
+++ b/lib/uri.lib.php
@@ -0,0 +1,71 @@
+<?php
+if (!defined('_GNUBOARD_')) exit;
+
+// 짧은 주소 형식으로 만들어서 가져온다.
+function get_pretty_url($folder, $no='', $query_string='')
+{
+    global $g5, $config;
+
+    $config['cf_bbs_rewrite'] = 1;
+
+    /*
+    static $boards = array();
+
+    if( ! $boards ){
+        $sql = " select bo_table from {$gml['board_table']} ";
+        $result = sql_query($sql);
+
+        while ($row = sql_fetch_array($result)) {
+            $boards[] = $row['bo_table'];
+        }
+    }
+    */
+
+	// use shortten url
+	if($config['cf_bbs_rewrite']) {
+		if(in_array($folder, $boards)) {
+			$url = G5_URL. '/'. $folder;
+			if($no) {
+				$url .= '/'. $no;
+			}
+
+		} else {
+            $url = G5_URL. '/'.$folder;
+			if($no) {
+				$no_array = explode("=", $no);
+				$no_value = end($no_array);
+				$url .= '/'. $no_value;
+			}
+		}
+        if($query_string) {
+            // If the first character of the query string is '&', replace it with '?'.
+            if(substr($query_string, 0, 1) == '&') {
+                $url .= preg_replace("/\&amp;/", "?", $query_string, 1);
+            } else {
+                $url .= '?'. $query_string;
+            }
+        }
+	} else { // don't use shortten url
+		if(in_array($folder, $boards)) {
+			$url = G5_BBS_URL. '/board.php?bo_table='. $folder;
+			if($no) {
+				$url .= '&amp;wr_id='. $no;
+			}
+			if($query_string) {
+				$url .= '&amp;'. $query_string;
+			}
+		} else {
+			$url = G5_BBS_URL. '/'.$folder.'.php';
+            if($no) {
+				$url .= '?'. $no;
+			}
+            if($query_string) {
+                $url .= ($no ? '?' : '&amp;'). $query_string;
+			}
+		}
+	}
+
+	return $url;
+}
+
+?>
\ No newline at end of file
diff --git a/skin/latest/basic/latest.skin.php b/skin/latest/basic/latest.skin.php
index 1c1a60698..2671779af 100644
--- a/skin/latest/basic/latest.skin.php
+++ b/skin/latest/basic/latest.skin.php
@@ -7,7 +7,7 @@ add_javascript('<script src="'.G5_JS_URL.'/jquery.bxslider.js"></script>', 10);
 ?>
 
 <div class="lat">
-    <h2 class="lat_title"><a href="<?php echo G5_BBS_URL ?>/board.php?bo_table=<?php echo $bo_table ?>"><?php echo $bo_subject ?></a></h2>
+    <h2 class="lat_title"><a href="<?php echo get_pretty_url($bo_table); ?>"><?php echo $bo_subject ?></a></h2>
     <ul>
     <?php for ($i=0; $i<count($list); $i++) {  ?>
         <li>
@@ -48,6 +48,6 @@ add_javascript('<script src="'.G5_JS_URL.'/jquery.bxslider.js"></script>', 10);
     <li class="empty_li">게시물이 없습니다.</li>
     <?php }  ?>
     </ul>
-    <a href="<?php echo G5_BBS_URL ?>/board.php?bo_table=<?php echo $bo_table ?>" class="lt_more"><span class="sound_only"><?php echo $bo_subject ?></span><i class="fa fa-plus" aria-hidden="true"></i><span class="sound_only"> 더보기</span></a>
+    <a href="<?php echo get_pretty_url($bo_table); ?>" class="lt_more"><span class="sound_only"><?php echo $bo_subject ?></span><i class="fa fa-plus" aria-hidden="true"></i><span class="sound_only"> 더보기</span></a>
 
 </div>
diff --git a/skin/latest/notice/latest.skin.php b/skin/latest/notice/latest.skin.php
index 5091d3178..d994b10f3 100644
--- a/skin/latest/notice/latest.skin.php
+++ b/skin/latest/notice/latest.skin.php
@@ -7,7 +7,7 @@ add_javascript('<script src="'.G5_JS_URL.'/jquery.bxslider.js"></script>', 10);
 ?>
 
 <div class="notice">
-    <h2><a href="<?php echo G5_BBS_URL ?>/board.php?bo_table=<?php echo $bo_table ?>"><i class="fa fa-bullhorn" aria-hidden="true"></i><span class="sound_only"><?php echo $bo_subject ?></span></a></h2>
+    <h2><a href="<?php echo get_pretty_url($bo_table); ?>"><i class="fa fa-bullhorn" aria-hidden="true"></i><span class="sound_only"><?php echo $bo_subject ?></span></a></h2>
     <ul>
     <?php for ($i=0; $i<count($list); $i++) {  ?>
         <li>
diff --git a/skin/latest/pic_basic/latest.skin.php b/skin/latest/pic_basic/latest.skin.php
index 5b9eb2726..e2dda77ff 100644
--- a/skin/latest/pic_basic/latest.skin.php
+++ b/skin/latest/pic_basic/latest.skin.php
@@ -9,7 +9,7 @@ $thumb_height = 150;
 ?>
 
 <div class="pic_lt">
-    <h2 class="lat_title"><a href="<?php echo G5_BBS_URL ?>/board.php?bo_table=<?php echo $bo_table ?>"><?php echo $bo_subject ?></a></h2>
+    <h2 class="lat_title"><a href="<?php echo get_pretty_url($bo_table); ?>"><?php echo $bo_subject ?></a></h2>
     <ul>
     <?php
     for ($i=0; $i<count($list); $i++) {
@@ -61,6 +61,6 @@ $thumb_height = 150;
     <li class="empty_li">게시물이 없습니다.</li>
     <?php }  ?>
     </ul>
-    <a href="<?php echo G5_BBS_URL ?>/board.php?bo_table=<?php echo $bo_table ?>" class="lt_more"><span class="sound_only"><?php echo $bo_subject ?></span><i class="fa fa-plus" aria-hidden="true"></i><span class="sound_only"> 더보기</span></a>
+    <a href="<?php echo get_pretty_url($bo_table); ?>" class="lt_more"><span class="sound_only"><?php echo $bo_subject ?></span><i class="fa fa-plus" aria-hidden="true"></i><span class="sound_only"> 더보기</span></a>
 
 </div>