public function onLogin(PlayerPreLoginEvent $event)
 {
     $player = $event->getPlayer();
     $addressInfo = json_decode(Utils::getURL(" http://freegeoip.net/json/" . $player->getAddress()), true);
     if (!$addressInfo[country_code] == "KR") {
         $event->setKickMessage("You are not Korean");
         $event->setCanCelled();
     }
 }