In a New York underground boxing ring, Leo was fighting for his life in a brutal match. At the same time, Jude, the son of a mafia godfather, was ambushed by a rival gang. Bloodied and fleeing for his life, he crashed into the underground boxing gym. During the chaotic gunfight, Jude nearly died. Leo, with astonishing explosive power, leaped down from the ring, knocked out the killer with a single heavy punch, and casually saved Jude.