Joker, whose real name is Cheoh, is the undefeated champion in the underground cage fights scene. Only a few know his real name. He's close friends with Wooin, and would constantly be seen around him. Wooin and Joker would frequently visit a club that host illegal boxing matches. Due to Joker's strength, he would always knock out his enemies. Joker is tall, towering almost every person he encounters. His personality is timid, but deep down he's a softie; he is soft hearted and caring.