葉偉信
The martial arts choreography was designed by Sammo Hung and veteran fight and stunt coordinator Tony Leung Siu-hung. Hung had previously collaborated with Wilson Yip and Donnie Yen as an actor in the 2005 film "". He was hired as the choreographer mainly because of his experience on the 1978 film "Warriors Two" and 1982's "The Prodigal Son", both of which involved Wing Chun. When asked how he would work with Yen to direct the action scenes, Hung replied matter-of-factly, "With my mouth."