Released from prison, a kung-fu expert (Donnie Yen) tries to help the police find a vicious serial killer (Wang Baoqiang) who targets martial-arts masters. info. play_arrow Trailer. info Watch in a web browser or on supported devices Learn More. About this movie. arrow_forward. A vicious killer stalks the streets of Hong Kong, methodically Genre : Action, Crime, Thriller. Hahou Mo is a martial arts instructor, who is jailed for killing a man, accidentally. But when a serial killer starts targeting kung fu experts, he offers to help the police in exchange for freedom. View Director and Cast. Subscribe to TRAILERS: to COMING SOON: http://bit.ly/H2vZUnSubscribe to INDIE TRAILERS: http://bit.ly/1F9OK9bLike us on FACEBOO nHdC.