Boxer Chen Feng was forced to participate in an underground competition with a high prize money in order to raise his father's high surgical expenses. However, in the final, he ran into his fellow apprentice Hong Jun, and the organizers made a last-minute effort to increase profits and stimulate excitementChanging the rules of the competition turned the battle between Chen Feng and Hong Jun into a life and death battle. The competition ended, Chen Feng won, but Hong Jun unexpectedly died on the boxing ring. Chen Feng was filled with immense guilt and self blameHe surrendered not only to 12 years of imprisonment, but also to bid farewell to his father and fianc é e. Ten years later, Chen Feng was released from prison and underground boxing continued. Chen Feng decided to use a pair of ironFist completely smashed the black and evil forces, seeking justice for the deceased relatives and living loved ones.