Alan Tam is a writer who has spent the last decade in a mental hospital. Upon leaving, he rents an apartment in an abandoned building which contains a clock that sends him back to 1984. The only person that can hear Alan during this time is one of the previous tenants, a young girl named Dolphin. A strange romance soon develops between the two, and so when her sister Whale begins dating a suspicious professor, Alan helps Dolphin to find out the shocking truth about her sister's beau.
| Actor | Role |
|---|---|
 Anthony Wong Chau-SangAlan Tam | Alan Tam |
| DDolphin Chan Hoi-HangDolphin / Shark | Dolphin / Shark |
 Parkman Wong Pak-ManOfficer Lee Sau | Officer Lee Sau |
 Lawrence NgWong Yu Yan, Anthropologist | Wong Yu Yan, Anthropologist |
 Teddy Yip Wing-ChoDolphin's Dad | Dolphin's Dad |
 Dayo Wong Chi-WahDr. Wong | Dr. Wong |
 Perrie Lai Hoi-SanWhale | Whale |
 Lee Chung-WaiNot listed | Not listed |
 Lau Ching-WanJoe [cameo] | Joe [cameo] |
 Chang Gan-WingLibrary Cleaner [cameo] | Library Cleaner [cameo] |
 Herman YauNot listed | Not listed |
 Bobby Yip Kin-SangNot listed | Not listed |
| WWong Lap-WaiNot listed | Not listed |
 Lee Man-PiuNot listed | Not listed |
 Quinton Wong Liu-CheNot listed | Not listed |
 Benny Lam Diy-KuenNot listed | Not listed |
 Hau Woon-LingNot listed | Not listed |
 Tony Leung Hung-WahNot listed | Not listed |
 Yu Miu-LinNot listed | Not listed |