In a thunderstorm night, a man runs out from a big house.  He drives a motorcycle away.  A girl, Au Yee, is chasing after him, yet, later on, the man’s motorcycle hits against a tree!  The man, Lau Hung, is in hospital.  Au Yee claims to be his wife.  Hung has lost his memory.  His face is badly hurt and he has to wear a mask.  Yee shows him their wedding photo, yet Hung cannot recognize himself…

His colleague, Mei Ling, comes to visit him.  While nobody is in, she seduces Hung and tells him her sexual relationship with him.  Hung finds his name on a receipt issued by a detective co.  He speaks to a detective Fong who discloses that before his loss of memory, Hung had asked him to trace  Yee as he suspects her loyalty to him.  The adulterer is Tang Leong, a bar proprietor… Suddenly, Yee admits to Hung her relationship with Leong and says that that day, after he discovered their adultery,  Hung was so furious that he killed Leong.  Then, he got frightened and rushed away on his motorcycle. Then, the accident happened. Although Hung does not believe it, he asks Fong to cancel the investigation.