He was the king of the underground fighting world in his homeland. He was young, handsome and rich. Many recognized world champions were not his rivals. He loved...He lived for her and battles...In one moment, all this was gone. He lost his life and even his name. The one with whom he had been in love since childhood betrayed him by plunging a knife into his heart... And in a completely different and distant world, a boy who had just died, lying in a dirty ditch, suddenly opened his eyes. New life awoke in this empty body. What does a person who has received a chance for a second life want? What path will Kai follow when he finds himself in a world where strength and skill rule? Martial arts rule!