diff --git a/helper/vworld.php b/helper/vworld.php
new file mode 100644
index 0000000..1edd2a0
--- /dev/null
+++ b/helper/vworld.php
@@ -0,0 +1,223 @@
+<?php
+/**
+ * @file vworld.php
+ * @date 2018-01-11
+ * @author Go Namhyeon <gnh1201@gmail.com>
+ * @brief Helper for vWorld (vworld.kr, molit.go.kr, 국토교통부)
+ */
+
+if(!function_exists("vworld_utf8_replace")) {
+	function vworld_utf8_replace($data) {
+		$regex = <<<'END'
+		/
+		  (
+			(?: [\x00-\x7F]                 # single-byte sequences   0xxxxxxx
+			|   [\xC0-\xDF][\x80-\xBF]      # double-byte sequences   110xxxxx 10xxxxxx
+			|   [\xE0-\xEF][\x80-\xBF]{2}   # triple-byte sequences   1110xxxx 10xxxxxx * 2
+			|   [\xF0-\xF7][\x80-\xBF]{3}   # quadruple-byte sequence 11110xxx 10xxxxxx * 3 
+			){1,100}                        # ...one or more times
+		  )
+		| .                                 # anything else
+		/x
+END;
+		if (is_array($data)) {
+			foreach ($data as $k=>$v) {
+				$data[$k] = utf8Replace($v);
+			}
+		}
+		else if (is_string($data)) {
+			$data = preg_replace($regex, '$1', $data);
+		}
+		return $data;
+	}
+}
+
+if(!function_exists("vworld_geocode_keyword")) {
+	function vworld_geocode_keyword($keyword, $category="Poi", $multiple=false) {
+		global $config;
+		
+		$geopoint = array(
+			"address" => "",
+			"latitude" => "", // y-pos
+			"longitude" => "" // x-pos
+		);
+
+		$req_urls = array(
+			"http://map.vworld.kr/search.do" // 키워드로 요청
+		);
+
+		// Poi 는 장소 검색. Jibun은 지번주소 검색. Juso는 도로명주소 검색
+		$poss_cates = array("Poi", "Jibun", "Juso");
+		if(!in_array($category, $poss_cates)) {
+			$category = "Poi";
+		}
+		$callback = "";
+		$q = $keyword;
+		$pageUnit = 1;
+		$output = "json";
+		$pageIndex = 1;
+		$apiKey = $config['vworld_api_key'];
+
+		// 전송 내용 명시
+		$req_data = array(
+			"callback" => $callback,
+			"q" => $q,
+			"category" => $category,
+			"pageUnit" => $pageUnit,
+			"output" => $output,
+			"pageIndex" => $pageIndex,
+			"apiKey" => $apiKey
+		);
+		$req_data_query = http_build_query($req_data);
+		$req_props = "";
+		$req_cnt = 0;
+		$succ_flag = false; // 성공했는지 여부
+		foreach($req_urls as $base_url) {
+			$req_props = "";
+			$req_real_url = $base_url . '?' . $req_data_query;
+
+			// request addr2coord
+			$ch = curl_init(); 
+			curl_setopt($ch,CURLOPT_URL, $req_real_url);
+			curl_setopt($ch,CURLOPT_RETURNTRANSFER, true);
+			//  curl_setopt($ch,CURLOPT_HEADER, false); 
+			if($req_output = curl_exec($ch)) {
+				if(!empty(trim($req_output))) {
+					$req_props = json_decode($req_output);
+					// 좌표만을 추출
+					$geo_list = array();
+					foreach($req_props->LIST as $req_row) {
+						$req_row = get_object_vars($req_row);
+						$geo_list[] = $req_row;
+					}
+					// 단일인지 복수인지
+					if($multiple == false) {
+						$req_props = $geo_list[0];
+					} else {
+						$req_props = $geo_list;
+					}
+					
+					$succ_flag = true;
+				}
+			}
+			curl_close($ch);
+			
+			// 요청 횟수를 기록
+			$req_cnt++;
+			// 성공했을 시 다음 주소로 넘어가지 않음
+			if($succ_flag == true) {
+				$xpos = $req_props['xpos'];
+				$ypos = $req_props['ypos'];
+				// store lat and lon
+				if($ypos > 0 && $xpos > 0) {
+					$geopoint['address'] = $req_props['juso'];
+					$geopoint['latitude'] = $ypos;
+					$geopoint['longitude'] = $xpos;
+				}
+				break;
+			} elseif($req_cnt = count($req_urls)) {
+				$req_props = "";
+			} else {
+				$req_props = "";
+			}
+		}
+		return $geopoint;
+	}
+}
+
+// get geocode from vworld
+if(!function_exists("vworld_geocode_addr2coord")) {
+	function vworld_geocode_addr2coord($addr) {
+		global $config;
+		
+		$geopoint = array(
+			"address" => "",
+			"latitude" => "", // y-pos
+			"longitude" => "" // x-pos
+		);
+		// base url
+		$req_urls = array(
+			"http://apis.vworld.kr/jibun2coord.do", // 구주소 요청
+			"http://apis.vworld.kr/new2coord.do" // 신주소 요청
+		);
+		
+		// 기본 설정
+		$apiKey = $config['vworld_api_key'];
+		$domain = $config['vworld_api_domain'];
+		$output = "json";
+		$epsg = "EPSG:4326"; // default is EPSG:4326
+		$callback = "";
+		
+		// 전송 내용 명시
+		$req_data = array(
+			"q" => $addr,
+			"apiKey" => $apiKey,
+			"domain" => $domain,
+			"output" => $output,
+			"epsg" => $epsg,
+			"callback" => $callback
+		);
+		$req_data_query = http_build_query($req_data);
+		
+		$req_props = "";
+		$req_cnt = 0;
+		$succ_flag = false; // 성공했는지 여부
+		foreach($req_urls as $base_url) {
+			$req_props = "";
+			$req_real_url = $base_url . '?' . $req_data_query;
+			
+			// request addr2coord
+			$ch = curl_init(); 
+			curl_setopt($ch, CURLOPT_URL, $req_real_url);
+			curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
+			//  curl_setopt($ch,CURLOPT_HEADER, false); 
+			if($req_output = curl_exec($ch)) {
+				if(!empty(trim($req_output))) {
+					$req_props = json_decode($req_output);
+					if(count($req_props) > 0) {
+						$req_props = get_object_vars($req_props);
+						$req_props = vworld_utf8_replace($req_props);
+						$succ_flag = true;
+					}
+				}
+			}
+			curl_close($ch);
+			
+			// 요청 횟수를 기록
+			$req_cnt++;
+			// 성공했을 시 다음 주소로 넘어가지 않음
+			if($succ_flag == true) {
+				$xpos = 0;
+				$ypos = 0;
+				switch($epsg) {
+					case "EPSG:900913":
+						$xpos = $req_props['EPSG_900913_X'] ;
+						$ypos = $req_props['EPSG_900913_Y'];
+						if($xpos > 0 && $ypos> 0) {
+							$geopoint['address'] = $req_props['JUSO'];
+							$geopoint['latitude'] = $ypos;
+							$geopoint['longitude'] = $xpos;
+						}
+						break;
+					case "EPSG:4326": // default is EPSG:4326
+					default:
+						$xpos = $req_props['EPSG_4326_X'];
+						$ypos = $req_props['EPSG_4326_Y'];
+						if($xpos > 0 && $ypos> 0) {
+							$geopoint['address'] = $req_props['JUSO'];
+							$geopoint['latitude'] = $ypos;
+							$geopoint['longitude'] = $xpos;
+						}
+						break;
+				}
+				
+				break;
+			} elseif($req_cnt = count($req_urls)) {
+				$req_props = "";
+			} else {
+				$req_props = "";
+			}
+		}
+		return $geopoint;
+	}
+}