Cast & crew
The Happy Trio (1975)
Directed by John Law Ma Written by Szeto On, Shu Lan
Cast
| Li Ching | Jiao Dapeng |
| Yau Fung | Roundhead / Blockhead |
| Wang Sha | Uncle Owen |
| Tang Ching | Gao Yunhu |
| Ku Chiu-Chin | Ms. Jäger |
| Lily Leung Shun-Yin | Ikebana Instructor |
| Joseph Koo | Pianist |
| Yeung Kei | Melartin's Wife |
| Lam Yuen | Ilona's Friend |
| Hui Ying-Sau |
Crew
| John Law Ma | Director |
| Joseph Koo | Original Music Composer |
| Run Run Shaw | Producer |
| Szeto On | Writer |
| Shu Lan | Writer |