Yi gai yun tian (1986)

During their last (botched) operation, Hong Kong cops Ho Ting-Bon and Long Man 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 Ting-Bon 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…