diff --git a/AvocadoEdition_Light/addons/sample/config.php b/AvocadoEdition_Light/addons/sample/config.php
new file mode 100644
index 0000000..02c4578
--- /dev/null
+++ b/AvocadoEdition_Light/addons/sample/config.php
@@ -0,0 +1,3 @@
+<?php
+if (!defined("_GNUBOARD_") && !defined("G5_IS_ADMIN"))
+  exit();
diff --git a/AvocadoEdition_Light/addons/sample/sample.addon.php b/AvocadoEdition_Light/addons/sample/sample.addon.php
index d21ee4a..06ab0ff 100644
--- a/AvocadoEdition_Light/addons/sample/sample.addon.php
+++ b/AvocadoEdition_Light/addons/sample/sample.addon.php
@@ -1,3 +1,86 @@
 <?php
-if (!defined("_GNUBOARD_"))
-  exit();
+class SampleAddon extends Addon
+{
+  public $name = "sample addon";
+  public $description = "샘플 애드온입니다.";
+  public $author = "Amber";
+  public $link = "https://info.drk.st/about";
+  public $version = "1.0.0";
+
+  /**
+   * Addon Loader 에서 자동으로 설정되는 값입니다.
+   * @var string $className
+   */
+  public $className;
+  /**
+   * Addon Loader 에서 자동으로 설정되는 값입니다.
+   * @var string $addonPath
+   */
+  public $addonPath;
+  /**
+   * Addon Loader 에서 자동으로 설정되는 값입니다.
+   * @var string $addonFile
+   */
+  public $addonFile;
+
+  /**
+   * 애드온 생성자입니다.
+   * @return void
+   */
+  public function __contstruct()
+  {
+
+  }
+
+  /**
+   * 애드온 동작을 이곳에 구현합니다. 현재는 $data 에 아무 값도 할당되지 않습니다.
+   * 필요한 경우 global $g5; 등을 통해 글로벌 변수를 가져와야 합니다.
+   * @param mixed $data
+   * @return void
+   */
+  public function init($data = [])
+  {
+    
+  }
+
+  /**
+   * 설정 페이지를 출력하는 함수입니다.
+   * @return void
+   */
+  public function printConfigForm()
+  {
+    $config = $this->getConfig();
+    echo '<div class="tbl_frm01 tbl_wrap">
+    <table>
+      <colgroup>
+        <col style="width: 140px;">
+        <col>
+      </colgroup>
+      <tbody>
+        <tr>
+          <th scope="row">
+            애드온 기능 활성화
+          </th>
+          <td>
+            <input type="checkbox" name="sample_addon_use" value="use" ' . (isset($config["sample_addon_use"]) ? "checked " : "" ) . '/>
+          </td>
+        </tr>
+      </tbody>
+    </table>
+  </div>';
+  }
+
+  public function getConfig()
+  {
+    global $g5;
+    
+    $sql = "SELECT addon_config FROM {$g5['addons_config_table']} WHERE addon_name = '{$this->className}'";
+    $result = sql_fetch($sql);
+    
+    if ($result && isset($result['addon_config'])) {
+      return json_decode($result['addon_config'], true) ?: [];
+    }
+    
+    return [];
+  }
+}
diff --git a/AvocadoEdition_Light/addons/sample/sample.config.php b/AvocadoEdition_Light/addons/sample/sample.config.php
deleted file mode 100644
index d21ee4a..0000000
--- a/AvocadoEdition_Light/addons/sample/sample.config.php
+++ /dev/null
@@ -1,3 +0,0 @@
-<?php
-if (!defined("_GNUBOARD_"))
-  exit();
diff --git a/AvocadoEdition_Light/adm/_gnb.site.menu.php b/AvocadoEdition_Light/adm/_gnb.site.menu.php
index 5485c3e..6aee5e3 100644
--- a/AvocadoEdition_Light/adm/_gnb.site.menu.php
+++ b/AvocadoEdition_Light/adm/_gnb.site.menu.php
@@ -7,22 +7,24 @@ $menu["config"] = new MenuCategory("config", "config", "사이트 설정", "/sit
 $menu["config"]->addChildMenu("config", "환경설정", G5_ADMIN_URL . "/site_config_form.php", true, 1, "\F3E5", 0);
 $menu["config"]->getLastAddedMenu()->addSubURL("/site_config_form_update.php");
 
-$menu["config"]->addChildMenu("config", "테마 설정", G5_ADMIN_URL . "/theme.php", true, 2, "\F4B2", 0);
+$menu["config"]->addChildMenu("config", "애드온 설정", G5_ADMIN_URL . "/addon_config.php", true, 2, "\F4CA", 0);
+
+$menu["config"]->addChildMenu("config", "홈페이지 폰트 설정", G5_ADMIN_URL . "/editor_font.php", true, 3, "\F5CB", 0);
+$menu["config"]->getLastAddedMenu()->addSubURL("/editor_font_update.php");
+
+$menu["config"]->addChildMenu("config", "테마 설정", G5_ADMIN_URL . "/theme.php", true, 4, "\F4B2", 0);
 $menu["config"]->getLastAddedMenu()->addSubURL("/theme_config_load.php");
 $menu["config"]->getLastAddedMenu()->addSubURL("/theme_detail.php");
 $menu["config"]->getLastAddedMenu()->addSubURL("/theme_update.php");
 $menu["config"]->getLastAddedMenu()->addSubURL("/theme_preview.php");
 
-$menu["config"]->addChildMenu("config", "메인 편집", G5_ADMIN_URL . "/viewer_form.php", true, 3, "\F3F4", 0);
-$menu["config"]->getLastAddedMenu()->addSubURL("/viewer_form_update.php");
-
-$menu["config"]->addChildMenu("config", "디자인 설정", G5_ADMIN_URL . "/design_form.php", true, 4, "\F1D8", 0);
+$menu["config"]->addChildMenu("config", "디자인 설정", G5_ADMIN_URL . "/design_form.php", true, 5, "\F1D8", 0);
 $menu["config"]->getLastAddedMenu()->addSubURL("/design_form_update.php");
 
-$menu["config"]->addChildMenu("config", "HTML에디터 폰트 설정", G5_ADMIN_URL . "/editor_font.php", true, 5, "\F3DA", 0);
-$menu["config"]->getLastAddedMenu()->addSubURL("/editor_font_update.php");
+$menu["config"]->addChildMenu("config", "메인 편집", G5_ADMIN_URL . "/viewer_form.php", true, 6, "\F891", 0);
+$menu["config"]->getLastAddedMenu()->addSubURL("/viewer_form_update.php");
 
-$menu["config"]->addChildMenu("config", "메뉴 설정", G5_ADMIN_URL . "/menu_list.php", true, 6, "\F478", 0);
+$menu["config"]->addChildMenu("config", "메뉴 설정", G5_ADMIN_URL . "/menu_list.php", true, 7, "\F478", 0);
 $menu["config"]->getLastAddedMenu()->addSubURL("/menu_list_update.php");
 $menu["config"]->getLastAddedMenu()->addSubURL("/menu_form.php");
 $menu["config"]->getLastAddedMenu()->addSubURL("/menu_form_search.php");
diff --git a/AvocadoEdition_Light/adm/addon_config.php b/AvocadoEdition_Light/adm/addon_config.php
new file mode 100644
index 0000000..7d29c23
--- /dev/null
+++ b/AvocadoEdition_Light/adm/addon_config.php
@@ -0,0 +1,107 @@
+<?php
+include_once __DIR__ . '/_common.php';
+include_once G5_EDITOR_LIB;
+
+if ($is_admin != 'super') {
+  alert_close('최고관리자만 접근 가능합니다.');
+}
+
+if (!sql_fetch_array(sql_query("DESC {$g5['addons_config_table']}"))) {
+  sql_query("CREATE TABLE {$g5['addons_config_table']} (
+    addon_name VARCHAR(255) PRIMARY KEY,
+    addon_version VARCHAR(255),
+    addon_config TEXT
+  );");
+}
+
+$g5['title'] = "애드온 설정";
+include_once __DIR__ . '/admin.head.php';
+
+add_stylesheet(get_embed_file("css", G5_PATH . "/adm/css/addon_config.css"), 1);
+?>
+<section class="addon_config">
+  <nav><span>설치된 애드온 목록</span><?php
+  if (!empty(AddonLoader::$addons)) {
+    foreach (AddonLoader::$addons as $menu) {
+      $selected = isset($_GET["addon"]) && $_GET["addon"] == $menu->className ? " selected" : "";
+      echo "<a href=\"./addon_config.php?addon={$menu->className}\" class=\"addon_menu{$selected}\">{$menu->name}</a>";
+    }
+  } else {
+    echo "<a href=\"#\">설치된 애드온이 없습니다.</a>";
+  }
+  ?></nav>
+  <section>
+    <?php
+    if (isset($_GET["addon"])) {
+      if (array_key_exists($_GET["addon"], AddonLoader::$addons)) {
+        $addon = AddonLoader::$addons[$addon];
+        ?>
+        <header>
+          <div class="tbl_frm01 tbl_wrap">
+            <table>
+              <colgroup>
+                <col style="width: 140px;">
+                <col>
+              </colgroup>
+              <tbody>
+                <tr>
+                  <th scope="row">
+                    애드온 이름
+                  </th>
+                  <td>
+                    <?= $addon->name ?>
+                  </td>
+                </tr>
+                <tr>
+                  <th scope="row">
+                    애드온 제작자
+                  </th>
+                  <td>
+                    <?= $addon->link ? "<a href=\"" . $addon->link . "\" target=\"_blank\">" . $addon->author . "</a>" : $addon->author ?>
+                  </td>
+                </tr>
+                <tr>
+                  <th scope="row">
+                    애드온 설명
+                  </th>
+                  <td>
+                    <?= $addon->description ?>
+                  </td>
+                </tr>
+                <tr>
+                  <th scope="row">
+                    애드온 버전
+                  </th>
+                  <td>
+                    <?= $addon->version ?>
+                  </td>
+                </tr>
+              </tbody>
+            </table>
+          </div>
+        </header>
+        <content>
+          <form method="POST" action="./addon_config_update.php">
+            <input type="hidden" name="addon" value="<?= $addon->className ?>" />
+            <?php
+            if (method_exists($addon, "printConfigForm")) {
+              $addon->printConfigForm();
+            }
+            ?>
+            <div class="btn_confirm">
+              <div class="btn">
+                <span class="material-icons">save</span>
+                <input type="submit" value="저장" class="btn_submit" accesskey="s">
+              </div>
+            </div>
+          </form>
+        </content><?php
+      }
+    } else {
+      echo "애드온을 선택하세요";
+    }
+    ?>
+  </section>
+</section>
+<?php
+include_once __DIR__ . '/admin.tail.php';
diff --git a/AvocadoEdition_Light/adm/addon_config_update.php b/AvocadoEdition_Light/adm/addon_config_update.php
new file mode 100644
index 0000000..b8965e3
--- /dev/null
+++ b/AvocadoEdition_Light/adm/addon_config_update.php
@@ -0,0 +1,54 @@
+<?php
+include_once __DIR__ . '/_common.php';
+
+if ($is_admin != 'super') {
+  alert_close('최고관리자만 접근 가능합니다.');
+}
+
+
+
+if (!isset($_POST['addon']) || empty($_POST['addon'])) {
+  alert('애드온 이름이 지정되지 않았습니다.');
+}
+
+$addon_name = $_POST['addon'];
+$filter = [
+  "addon",
+  "token"
+];
+
+if (array_key_exists($addon_name, AddonLoader::$addons)) {
+  $addon = AddonLoader::$addons[$addon_name];
+
+  $config_data = [];
+  foreach ($_POST as $key => $value) {
+    if (!in_array($key, $filter)) {
+      $config_data[$key] = $value;
+    }
+  }
+
+  $config_data["saved_date"] = (new DateTime())->getTimestamp();
+
+  $config_json = addslashes(json_encode($config_data, JSON_UNESCAPED_UNICODE | JSON_UNESCAPED_SLASHES));
+
+  $sql = " SELECT COUNT(*) as cnt FROM {$g5['addons_config_table']} WHERE addon_name = '{$addon_name}' ";
+  $row = sql_fetch($sql);
+
+  if ($row['cnt'] > 0) {
+    $sql = " UPDATE {$g5['addons_config_table']}
+                SET addon_config = '{$config_json}',
+                    addon_version = '{$addon->version}'
+              WHERE addon_name = '{$addon_name}' ";
+  } else {
+    $sql = " INSERT INTO {$g5['addons_config_table']}
+                SET addon_name = '{$addon_name}',
+                    addon_config = '{$config_json}',
+                    addon_version = '{$addon->version}' ";
+  }
+
+  sql_query($sql);
+} else {
+  alert("애드온이 설정되지 않았습니다.");
+}
+
+goto_url('./addon_config.php?addon=' . $addon_name);
diff --git a/AvocadoEdition_Light/adm/admin.head.php b/AvocadoEdition_Light/adm/admin.head.php
index ae86d55..ea975b6 100644
--- a/AvocadoEdition_Light/adm/admin.head.php
+++ b/AvocadoEdition_Light/adm/admin.head.php
@@ -2,7 +2,7 @@
 if (!defined('_GNUBOARD_'))
   exit;
 
-$begin_time = get_microtime();
+$begin_time = microtime(true);
 
 include_once G5_PATH . '/head.sub.php';
 ?>
diff --git a/AvocadoEdition_Light/adm/css/addon_config.css b/AvocadoEdition_Light/adm/css/addon_config.css
new file mode 100644
index 0000000..69b9c8f
--- /dev/null
+++ b/AvocadoEdition_Light/adm/css/addon_config.css
@@ -0,0 +1,70 @@
+
+th a {
+  display: inline-block;
+  vertical-align: middle;
+  padding: 3px 10px;
+  background: #ecc6c6;
+  color: #fff;
+  margin: 5px 0 0;
+}
+
+th a+a {
+  margin-top: 3px;
+}
+
+#wrap {
+  height: 100%;
+}
+
+#container {
+  padding: 0 !important;
+  min-height: 100%;
+}
+
+#wrapper {
+  height: 100%;
+  box-sizing: border-box;
+}
+
+#container section.addon_config {
+  display: flex;
+  height: 100%;
+  padding: 8px;
+  gap: 8px;
+}
+
+.addon_config>nav {
+  min-width: 200px;
+  display: flex;
+  flex-direction: column;
+  border: 1px solid #d18686;
+  border-radius: 4px;
+  overflow:hidden;
+}
+
+.addon_config>nav>* {
+  padding: 0 12px;
+  line-height: 32px;
+}
+
+.addon_config>nav>a.selected {
+  background: #ecc6c6;
+  font-weight: bold;
+}
+
+.addon_config>nav>span {
+  background: #d18686;
+  color: #FFF;
+  line-height: 48px;
+}
+
+.addon_config>section {
+  flex-grow: 1;
+  display: flex;
+  flex-direction: column;
+  gap: 8px;
+}
+
+td a {
+  color: #d18686;
+}
diff --git a/AvocadoEdition_Light/adm/design_form_update.php b/AvocadoEdition_Light/adm/design_form_update.php
index 72d4fcd..7dd0a4c 100644
--- a/AvocadoEdition_Light/adm/design_form_update.php
+++ b/AvocadoEdition_Light/adm/design_form_update.php
@@ -1,6 +1,25 @@
 <?php
 /**
- * @suppress php0410
+ * @var string[][] $cs_etc_1
+ * @var string[][] $cs_etc_2
+ * @var string[][] $cs_etc_3
+ * @var string[][] $cs_etc_4
+ * @var string[][] $cs_etc_5
+ * @var string[][] $cs_etc_6
+ * @var string[][] $cs_etc_7
+ * @var string[][] $cs_etc_8
+ * @var string[][] $cs_etc_9
+ * @var string[][] $cs_etc_10
+ * @var string[][] $cs_etc_11
+ * @var string[][] $cs_etc_12
+ * @var string[][] $cs_etc_13
+ * @var string[][] $cs_etc_14
+ * @var string[][] $cs_etc_15
+ * @var string[][] $cs_etc_16
+ * @var string[][] $cs_etc_17
+ * @var string[][] $cs_etc_18
+ * @var string[][] $cs_etc_19
+ * @var string[][] $cs_etc_20
  */
 $sub_menu = "100300";
 include_once "./_common.php";
diff --git a/AvocadoEdition_Light/adm/editor_font.php b/AvocadoEdition_Light/adm/editor_font.php
index 6a5cc85..2645e8e 100644
--- a/AvocadoEdition_Light/adm/editor_font.php
+++ b/AvocadoEdition_Light/adm/editor_font.php
@@ -33,6 +33,8 @@ $result = sql_query($sql);
 $g5['title'] = "에디터 폰트 관리";
 
 include_once __DIR__ . '/admin.head.php';
+
+EventHandler::triggerEvent("amber.admin.editor_font_form_before");
 ?>
 <style>
   th a {
@@ -167,4 +169,5 @@ include_once __DIR__ . '/admin.head.php';
   }
 </script>
 <?php
+EventHandler::triggerEvent("amber.admin.editor_font_form_after");
 include_once __DIR__ . '/admin.tail.php';
diff --git a/AvocadoEdition_Light/adm/editor_font_update.php b/AvocadoEdition_Light/adm/editor_font_update.php
index bf68277..0b620c1 100644
--- a/AvocadoEdition_Light/adm/editor_font_update.php
+++ b/AvocadoEdition_Light/adm/editor_font_update.php
@@ -1,6 +1,7 @@
 <?php
 include_once "./_common.php";
 
+
 if ($is_admin != 'super') {
   alert('최고관리자만 접근 가능합니다.');
 }
@@ -18,6 +19,8 @@ if ($w == '') {
   $font_css = isset($_POST['font_css']) ? stripslashes(trim($_POST['font_css'])) : '';
   $font_name = isset($_POST['font_name']) ? clean_xss_tags(trim($_POST['font_name'])) : '';
 
+  EventHandler::triggerEvent("amber.admin.editor_font_update_before", $font_css, $font_name);
+
   if (empty($font_css) || empty($font_name)) {
     alert('@font-face CSS 또는 @import URL과 폰트 이름은 필수 입력 항목입니다.');
   }
@@ -70,11 +73,13 @@ if ($w == '') {
 
   $msg = '폰트가 추가되었습니다.';
 
+  EventHandler::triggerEvent("amber.admin.editor_font_update_after", $font_css, $font_name);
 } else if ($w == 'd') {
   $sql = " DELETE FROM {$g5['font_table']} WHERE font_id = '{$font_id}' ";
   sql_query($sql);
 
   $msg = '폰트가 삭제되었습니다.';
+  EventHandler::triggerEvent("amber.admin.editor_font_update_deleted", $font_id);
 }
 
 if ($msg) {
diff --git a/AvocadoEdition_Light/adm/head.sub.php b/AvocadoEdition_Light/adm/head.sub.php
index c2430dd..19abd7c 100644
--- a/AvocadoEdition_Light/adm/head.sub.php
+++ b/AvocadoEdition_Light/adm/head.sub.php
@@ -46,7 +46,7 @@ if (!isset($g5['title'])) {
     var g5_editor = "<?php echo ($config['cf_editor'] && $board['bo_use_dhtml_editor']) ? $config['cf_editor'] : ''; ?>";
     var g5_cookie_domain = "<?php echo G5_COOKIE_DOMAIN ?>";
     <?php if (defined('G5_IS_ADMIN')) { ?>
-      var g5_admin_url = "<?php echo G5_ADMIN_URL; ?>";
+    var g5_admin_url = "<?php echo G5_ADMIN_URL; ?>";
     <?php } ?>
   </script>
   <script src="<?php echo G5_JS_URL ?>/jquery-1.8.3.min.js"></script>
diff --git a/AvocadoEdition_Light/adm/member_delete.php b/AvocadoEdition_Light/adm/member_delete.php
index 2a5ef06..9688beb 100644
--- a/AvocadoEdition_Light/adm/member_delete.php
+++ b/AvocadoEdition_Light/adm/member_delete.php
@@ -8,6 +8,8 @@ auth_check($auth[$sub_menu], "d");
 
 $mb = get_member($_POST['mb_id']);
 
+EventHandler::triggerEvent("amber.admin.member_delete_before", $mb, $qstr);
+
 if (!$mb['mb_id'])
   alert("회원자료가 존재하지 않습니다.");
 else if ($member['mb_id'] == $mb['mb_id'])
@@ -22,6 +24,8 @@ check_admin_token();
 // 회원자료 삭제
 member_delete($mb['mb_id']);
 
+EventHandler::triggerEvent("amber.admin.member_delete_after", $mb, $qstr);
+
 if ($url)
   goto_url("{$url}?$qstr&amp;w=u&amp;mb_id=$mb_id");
 else
diff --git a/AvocadoEdition_Light/adm/member_list_delete.php b/AvocadoEdition_Light/adm/member_list_delete.php
index 19c9ccb..294b336 100644
--- a/AvocadoEdition_Light/adm/member_list_delete.php
+++ b/AvocadoEdition_Light/adm/member_list_delete.php
@@ -15,6 +15,8 @@ for ($i = 0; $i < count($chk); $i++) {
 
   $mb = get_member($_POST['mb_id'][$k]);
 
+  EventHandler::triggerEvent("amber.admin.member_delete_list_before", $mb);
+
   if (!$mb['mb_id']) {
     $msg .= "{$mb['mb_id']} : 회원자료가 존재하지 않습니다.\\n";
   } else if ($member['mb_id'] == $mb['mb_id']) {
@@ -27,9 +29,12 @@ for ($i = 0; $i < count($chk); $i++) {
     // 회원자료 삭제
     member_delete($mb['mb_id']);
   }
+
+  EventHandler::triggerEvent("amber.admin.member_delete_list_after", $mb);
 }
 
-if ($msg)
+if ($msg) {
   echo "<script type='text/javascript'> alert('$msg'); </script>";
+}
 
 goto_url("./member_list.php?$qstr");
diff --git a/AvocadoEdition_Light/adm/member_list_update.php b/AvocadoEdition_Light/adm/member_list_update.php
index 724b758..fcce5e8 100644
--- a/AvocadoEdition_Light/adm/member_list_update.php
+++ b/AvocadoEdition_Light/adm/member_list_update.php
@@ -11,7 +11,6 @@ if (!count($_POST['chk'])) {
 auth_check($auth[$sub_menu], 'w');
 
 if ($_POST['act_button'] == "선택수정") {
-
   for ($i = 0; $i < count($_POST['chk']); $i++) {
     // 실제 번호를 넘김
     $k = $_POST['chk'][$i];
diff --git a/AvocadoEdition_Light/classes/addon/addon.class.php b/AvocadoEdition_Light/classes/addon/addon.class.php
new file mode 100644
index 0000000..52dcbb3
--- /dev/null
+++ b/AvocadoEdition_Light/classes/addon/addon.class.php
@@ -0,0 +1,17 @@
+<?php
+class Addon
+{
+  public $name = "";
+  public $description = "";
+  public $author = "";
+  public $link = "https://info.drk.st/about";
+  public $version = "";
+  public $className;
+  public $addonFile;
+  public $addonPath;
+
+  public function __contstruct()
+  {
+
+  }
+}
diff --git a/AvocadoEdition_Light/classes/addonloader/addonloader.class.php b/AvocadoEdition_Light/classes/addonloader/addonloader.class.php
new file mode 100644
index 0000000..c91ef03
--- /dev/null
+++ b/AvocadoEdition_Light/classes/addonloader/addonloader.class.php
@@ -0,0 +1,48 @@
+<?php
+class AddonLoader
+{
+  private $addonPath;
+  /**
+   * @var Addon[] $addons
+   */
+  public static $addons;
+
+  public function __construct($addonPath)
+  {
+    $this->addonPath = $addonPath;
+  }
+
+  public function loadAddons()
+  {
+    if (!is_dir($this->addonPath)) {
+      throw new Exception("지정한 폴더가 디렉토리가 아닙니다.: " . $this->addonPath);
+    }
+
+    $addonDirs = glob("{$this->addonPath}/*", GLOB_ONLYDIR);
+
+    foreach ($addonDirs as $addonDir) {
+      $addonName = basename($addonDir);
+      $addonFile = $addonDir . '/' . $addonName . '.addon.php';
+
+      if (file_exists($addonFile)) {
+        require_once $addonFile;
+
+        $className = $this->getAddonClassName($addonName);
+        if (class_exists($className)) {
+          $addon = new $className();
+          $addon->className = $className;
+          $addon->addonFile = $addonFile;
+          $addon->addonPath = $addonDir;
+          $addon->init();
+          
+          self::$addons[$className] = $addon;
+        }
+      }
+    }
+  }
+
+  private function getAddonClassName($addonName)
+  {
+    return str_replace(' ', '', ucwords(str_replace('_', ' ', $addonName))) . 'Addon';
+  }
+}
diff --git a/AvocadoEdition_Light/classes/event_handler.php b/AvocadoEdition_Light/classes/event_handler.php
index 0abdd1f..55139d2 100644
--- a/AvocadoEdition_Light/classes/event_handler.php
+++ b/AvocadoEdition_Light/classes/event_handler.php
@@ -15,6 +15,12 @@ class EventHandler
    * @var string[]
    */
   protected static $gnuboardCompatibleList = [
+    // adm/editor_font.php
+    "amber.admin.editor_font_form_before"                     => "", // amber only
+    "amber.admin.editor_font_form_after"                      => "", // amber only
+    // adm/editor_font_update.php
+    "amber.admin.editor_font_update_before"                   => "", // amber only
+    "amber.admin.editor_font_update_after"                    => "", // amber only
     // common.php
     "gnuboard.loadlibs.after"                                 => "", // amber only
     "gnuboard.htmlprocess.before"                             => "common_header",
@@ -197,7 +203,7 @@ class EventHandler
       else if ($key === 1)
         $key = "end";
       $backtrace = debug_backtrace(DEBUG_BACKTRACE_IGNORE_ARGS, 2);
-      $cf = $backtrace[1]['function'] ?? 'global scope';
+      $cf = $backtrace[1]['function'] ? $backtrace[1]['function'] : 'global scope';
       self::addStopwatch("{$cf} {$key}");
     }
   }
diff --git a/AvocadoEdition_Light/common.php b/AvocadoEdition_Light/common.php
index d0c298f..e310edc 100644
--- a/AvocadoEdition_Light/common.php
+++ b/AvocadoEdition_Light/common.php
@@ -250,7 +250,14 @@ include_once $g5_path['path'] . '/config.php';
 $_system = new stdClass;
 $_system->g5_path = $g5_path;
 $_system->classes = load_libs(__DIR__ . "/classes", "class");
-$_system->addons = load_libs(__DIR__ . "/addons", "addon");
+// $_system->addons = load_libs(__DIR__ . "/addons", "addon");
+
+define("G5_ADDON_PATH", __DIR__ . "/addons");
+
+// addon loader
+$_addon_loader = new AddonLoader(G5_ADDON_PATH);
+$_addon_loader->loadAddons();
+
 // future update... maybe
 // $_system->modules = load_libs(__DIR__ . "/modules", "model");
 // $_system->modules = load_libs(__DIR__ . "/modules");
@@ -352,7 +359,9 @@ $dbconfig_file = G5_DATA_PATH . '/' . G5_DBCONFIG_FILE;
 if (file_exists($dbconfig_file)) {
   include_once $dbconfig_file;
   include_once G5_LIB_PATH . '/common.lib.php'; // 공통 라이브러리
+
   $g5["font_table"] = G5_TABLE_PREFIX . "editor_fonts";
+  $g5["addons_config_table"] = G5_TABLE_PREFIX . "addons_config";
 
   $connect_db = sql_connect(G5_MYSQL_HOST, G5_MYSQL_USER, G5_MYSQL_PASSWORD) or die('MySQL Connect Error!!!');
   $select_db = sql_select_db(G5_MYSQL_DB, $connect_db) or die('MySQL DB Error!!!');
@@ -588,7 +597,7 @@ if (isset($_REQUEST['url'])) {
   $url = '';
   $urlencode = urlencode($_SERVER['REQUEST_URI']);
   if (defined("G5_DOMAIN")) {
-    $p = @parse_url(G5_DOMAIN ?? "");
+    $p = @parse_url(G5_DOMAIN ? G5_DOMAIN : "");
     $p['path'] = isset($p['path']) ? $p['path'] : '/';
     $urlencode = G5_DOMAIN . urldecode(preg_replace("/^" . urlencode($p['path']) . "/", "", $urlencode));
   }
diff --git a/AvocadoEdition_Light/lib/Hook/hook.class.php b/AvocadoEdition_Light/lib/Hook/hook.class.php
index 89746a2..5b1facd 100644
--- a/AvocadoEdition_Light/lib/Hook/hook.class.php
+++ b/AvocadoEdition_Light/lib/Hook/hook.class.php
@@ -164,7 +164,7 @@ class Hook
    * @param mixed  $args   → optional arguments
    * @param bool   $remove → delete hook after executing actions
    *
-   * @return returns the output of the last action or false
+   * @return mixed returns the output of the last action or false
    */
   public static function doAction($tag, $args = array(), $remove = true)
   {
@@ -245,15 +245,15 @@ class Hook
    * @param string $action → action hook
    * @param int    $args   → arguments
    *
-   * @return callable|false → returns the calling function
+   * @return callable|false|null → returns the calling function
    */
   protected function runAction($action, $args)
   {
     $function = $action['function'];
     $argsNumber = $action['arguments'];
 
-    $class = (isset($function[0])) ? $function[0] : false;
-    $method = (isset($function[1])) ? $function[1] : false;
+    $class = isset($function[0]) ? $function[0] : false;
+    $method = isset($function[1]) ? $function[1] : false;
 
     $args = $this->getArguments($argsNumber, $args);
 
@@ -291,7 +291,7 @@ class Hook
       }
     }
 
-    return (isset($actions)) ? $actions : array();
+    return isset($actions) ? $actions : array();
   }
 
   /**