Based on

Movies like Diary of a Big Man (1988)

A two-timing bigamist finds himself concocting scheme after scheme with his best friend, Chi Hung, to prevent either of his wives from discovering his bigamy. The unwanted intervention of a police officer as well as a series of unfortunate events lead to the wives discovery of the whole plot. They team up with Chi Hung's exasperated fiancée, Ka Lai, to exact revenge upon the two men.