During their last (botched) operation, Hong Kong cops Chow Yun-Fat and Lui Fong accidentally cause the slight head injury of a pretty young woman. Because she has entered the country illegally, and has no other place to live, she pretends that she has amnesia and that she thinks Yun-Fat is her husband. He feels guilty about her "condition", so he lets her stay in his house. But there is someone from her past stalking her, with bad intentions...
