Óscar is a promoter and manager of boxing who, in addition to controlling the professional career of his young pupils with the intention of taking them to stardom, is also responsible for monitoring their love life. One of the boxers he promotes, Miguel Valdés, starts dating Elena, a young and beautiful model of whom the promoter is in love. The maneuvers to undo the relationship do not work and, mad with jealousy, he organizes in retaliation a bloody fight against another brilliant pupil, José Laguna, who will have fateful consequences for Miguel.