The film stars Wu Jing, Ronald Cheng, Miki Yeung, Theresa Fu, Cheung Siu-fai, Ken Lo, Andy On, Lam Suet and Timmy Hung.

A small-time gambling boss, Ma, is so impressed with Kong that he wants him to be his fighter in the underground all-contact boxing world.

The film was produced by Law's production company, Point of View Movie Production Co. Ltd., Charles Heung's China Star Entertainment and Paco Wong's Gold Label Entertainment, the management company of Wu Jing, Ronald Cheng and Miki Yeung.

Li had served as choreographer and stunt coordinator for Dennis Law's previous two films The Unusual Youth and Love @ First Note.

The major fight scene between Wu and Xing Yu required two rehearsals before proceeding to actual filming, which was done in two takes.