diff --git a/helper/zeroboard4.dbt.php b/helper/zeroboard4.dbt.php
new file mode 100644
index 0000000..c9207fb
--- /dev/null
+++ b/helper/zeroboard4.dbt.php
@@ -0,0 +1,121 @@
+<?php
+/**
+ * @file zeroboard4.dbt.php
+ * @date 2018-08-20
+ * @author Go Namhyeon <gnh1201@gmail.com>
+ * @brief Database Helper for Zeroboard 4 PL 9 (experimental)
+ */
+
+// get database prefix
+if(!function_exists("zb4_get_db_prefix")) {
+	function zb4_get_db_prefix() {
+		return "zetyx_";
+	}
+}
+
+// get table
+if(!function_exists("zb4_get_db_table")) {
+	function zb4_get_db_table($tablename) {
+		return (zb4_get_db_prefix() . $tablename);
+	}
+}
+
+// get write table
+if(!function_exists("zb4_get_write_table")) {
+	function zb4_get_write_table($tablename, $version=4) {
+		$write_prefix = zb4_get_db_prefix() . "board_";
+		$write_table = $write_prefix . $tablename;
+		return $write_table;
+	}
+}
+
+// write post
+if(!function_exists("zb4_write_post")) {
+	function zb4_write_post($tablename, $data=array()) {
+		$result = 0;
+		$write_table = zb4_get_write_table($tablename);
+		$mb_id = get_current_user_name();
+
+		// load helpers
+		loadHelper("networktool");
+		loadHelper("naturename.kr");
+
+		$write_fields = array();
+		$write_default_fields = array(
+			//"no" => "", // auto increment
+			"division" => "1",
+			"headnum" => "0",
+			"arrangenum" => "0",
+			"depth" => "0",
+			"prev_no" => "0",
+			"next_no" => "0",
+			"father" => "0",
+			"child" => "0",
+			"ismember" => "0",
+			"islevel" => "10",
+			"memo" => ""
+			"ip" => get_network_client_addr(),
+			"password" => "",
+			"name" => naturename_kr_get_generated_name(),
+			"homepage" => "",
+			"email" => "",
+			"subject" => "",
+			"use_html" => "0",
+			"reply_mail" => "0",
+			"category" => "1",
+			"is_secret" => "0",
+			"sitelink1" => "",
+			"sitelink2" => "",
+			"file_name1" => "",
+			"file_name2" => "",
+			"s_file_name1" => "",
+			"s_file_name2" => "",
+			"download1" => "0",
+			"download2" => "0",
+			"reg_date" => "0",
+			"hit" => "0",
+			"vote" => "0",
+			"total_comment" => "0",
+			"x" => "",
+			"y" => "",
+		);
+
+		foreach($write_default_fields as $k=>$v) {
+			if(in_array($k, array("mb_id", "wr_num"))) {
+				$write_fields[$k] = $v;
+			} else {
+				$write_fields[$k] = array_key_empty($k, $data) ? $v : $data[$k];
+			}
+		}
+
+		foreach($data as $k=>$v) {
+			if(!in_array($k, $write_default_fields)) {
+				$write_fields[$k] = $v;
+			}
+		}
+
+		if(count($write_fields) > 0) {
+			$sql = get_bind_to_sql_insert($write_table, $write_fields);
+			if(exec_db_query($sql, $write_fields)) {
+				$result = get_db_last_id();
+			}
+		}
+
+		return $result;
+	}
+}
+
+if(!function_exists("zb4_get_posts")) {
+	function zb4_get_posts($table_name, $page=1, $limit=20, $options=array()) {
+		$sql = "select * from " . zb4_get_write_table($table_name) . " order by no desc" . get_page_range($page, $limit);
+		return exec_db_fetch_all($sql);
+	}
+}
+if(!function_exists("zb4_get_post_by_id")) {
+	function zb4_get_post_by_id($table_name, $post_id) {
+		$sql = "select * from " . zb4_get_write_table($table_name) . " where no = :no";
+		return exec_db_fetch($sql, array(
+			"no" => $post_id
+		));
+	}
+}