Cheung Sheung and Tze Ngor are twin sisters. Tze Ngor is a lunatic and stays in a mental hospital. But out of a madcap incident, Cheung Sheung is "cheated" into the hospital, exchanging identity with her insane sister. The mad house is lived by all kinds of weirdos. The "game" is that Cheung Sheung will stay in the hospital only for a while. But strangely enough, she gradually becomes more and more ease with the way of life in the hospital until one day, she's forgotten what life is like...
| Actor | Role |
|---|---|
 Eric Tsang Chi-WaiMeng Chia Li | Meng Chia Li |
 Richard Ng Yiu-HonDr. Alan Lam | Dr. Alan Lam |
 Stanley Fung Shui-FanMa's Solicitor | Ma's Solicitor |
 Charlie Chin Chiang-LinDr. Chin | Dr. Chin |
 Loletta Lee Lai-ChunYun Yun | Yun Yun |
 Cora MiaoChieh Chang Chang / Chieh Chi Ao | Chieh Chang Chang / Chieh Chi Ao |
 Mang HoiPostman | Postman |
 Tai BoGangster | Gangster |
 Billy Ching Sau-YatGangster | Gangster |
 James Wong JimMa Shih Mei | Ma Shih Mei |
 Meg Lam Kin-MingForgetful Nurse Ling | Forgetful Nurse Ling |
 Lo Hoi-PangTraffic Policeman | Traffic Policeman |
 Sandy LamMei | Mei |
 Cheung Tat-MingMental Patient | Mental Patient |
 Michael ChowMental Patient | Mental Patient |
 Michael Chow Man-KinMental patient | Mental patient |
 Liu Kai-ChiNot listed | Not listed |
 Lee Heung-KamNot listed | Not listed |
 David WuNot listed | Not listed |
 May Law Koon-LanMental patient | Mental patient |