Liu Jin-xi (Yen) is a village craftsman whose quiet life is irrevocably shattered by the arrival of two notorious gangsters in the local general store. When Liu single-handedly saves the shopkeeper's life, he comes under investigation by detective Xu Bai-jiu (Kaneshiro). Convinced that Liu's martial arts mastery belies a hidden history of training by one of the region's vicious clans, Xu doggedly pursues the shy hero-and draws the attention of China's criminal underworld in the process (c) Weinstein Co.

Casts:
- Donnie Yen as Liu Jinxi, who is actually Tang Long, the son of the Master.
- Takeshi Kaneshiro as Xu Baijiu, a detective versed in physiology and acupuncture. .
- Tang Wei as Yu, Liu Jinxi's wife.
- Jimmy Wang as the Master, the leader of the 72 Demons and Tang Long's father.
- Kara Hui as 13th Madam, the Master's wife.
- Li Xiaoran as Xu Baijiu's estranged wife
- Jiang Wu as Xu Baijiu's investigator