Kai 

He is a fighter at Guardians Gym. His life is about to be changed forever, once he meets a masked fighter.

EXO-K

The best fighters at Guardians Gym, Kai is a part of this group.

Taemin

He is a fighter at the Lucifer Gym, he wears a mask in his fights. He gets mistaken for a girl a lot.

Shinee

The best group of fighters at Lucifer Gym. Taemin is a part of this group.