Membership level. According to the query of DNF official website, DNF officially launched Shengyao service, which is divided into Shengyao ordinary users, Shengyao Silver Penguin, Golden Penguin and Diamond Penguin. Only users of Silver Penguin and above have online manual customer service to deal with problems, which is a member level. DNF(Dungeon and Warrior) is a free role-playing 2D game developed by Korean online game company NEOPLE, released by Samsung Electronics, and officially released in Korea in August 2005.