Middleweight champion Yoon Jung-ho (Kim Ki-soo) accidentally kills his opponent by striking a vital point during a match. Following this incident, he retires from the ring and begins to help the two younger siblings of his deceased opponent. However, due to the earnest last wish of his late coach and the heartbreaking pleas of the two orphans he cares for, he is forced to return to the boxing world. Back in the ring, he knocks out his opponent and reclaims his throne as the prince of boxing.