Without spoiling it, the movie features a legendary cameo by Jimmy Wang Yu , the star of the 1967 classic The One-Armed Swordsman
. Donnie Yen plays Liu Jinxi, a seemingly humble papermaker who accidentally kills two notorious criminals. The "interesting" twist is the detective, Xu Baiju (played by Takeshi Kaneshiro), who uses forensic science and physiology Dragon -Wu Xia- -2011- -MM Sub-.avi