Hahou Mo, a martial arts expert and police self-defense instructor is incarcerated for involuntary manslaughter during a fight with an opponent. Three years later, a vicious killer emerges and starts killing retired martial arts masters that Hahou knows. With his own personal agenda, Hahou reveals he knows the killer's next intended victims and offers to aid Inspector Luk Yuen-Sum in capturing the killer with his martial arts skills and knowledge in exchange for his freedom.
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