A man once hailed as the world's strongest, the heavyweight champion of the largest fighting league, Choi Hyunseok, begins a new life as a hero in another world after his death. "A hero who has it all—wealth, honor, beautiful women!" With dreams of a glorious future, he crosses over to this new world, only to be greeted by a towering, muscular monster with the head of a bull. The monster, an officer in the Demon King's army, sneers: "Hero? You’re supposed to be a hero?" "Uh... I think so...?"