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.
Unfortunately the movie The Diary of a Big Man is not yet available on HBO Max.
| Directing | Chor Yuen | Director |
| Production | Tsui Hark | Producer |
| Writing | Philip Cheng Chung-Tai | Writer |
| Writing | Ng Man-Fai | Writer |
| Directing | File Ip Kwok-Wing | Assistant Director |
| Sound | Chow Yun-fat | Songs |
