Two couples move into the same small tenement building in 1960s Hong Kong on the same day. Mrs. Chan (Maggie Cheung) is a secretary and personal assistant at a travel company, working under her adulterous boss and literally keeping his affairs in order, whilst her husband is often away on business for longs periods of time. Mr. Chow (Tony Leung) is a writer whose dreams of writing martial arts serials have floundered due to lack of inspiration. His wife often works late too. When Mrs. Chan and Mr. Chow begin to suspect that their respective partners are having an affair with one another, the two become close, and the chance to follow in their partner’s footsteps becomes a tentative possibility.