Qin Lu. Some people call him a master of tactics, while others call him a master of mechanical modification, a master of firearms modification, a master of ammunition manufacturing, and so on. However, he prefers others to call him - the Great Demon King. If others were to comment on his character, they would all say the same thing: "You are a piece of shit. If you can't beat him, you will call him a slut like my sister!"