![](https://image.tmdb.org/t/p/w92/7UYRnOZXSmJFcQGPBUSFbyY07zZ.jpg)
Anthony Wong Chau-Sang
Alan Tam
Dolphin Chan Hoi-Hang
Dolphin / Shark
![](https://image.tmdb.org/t/p/w92/tYgmuuA4iNK1eecRgMGGcVGub9Y.jpg)
Parkman Wong
Officer Lee Sau
![](https://image.tmdb.org/t/p/w92/3xRYtS2dQxRNxyFz3OYZUeU5lso.jpg)
Lawrence Ng
Wong Yu Yan, Anthropologist
![](https://image.tmdb.org/t/p/w92/tfJWAnUqq312lO64fEP7jVP8MPl.jpg)
Teddy Yip Wing-Cho
Dolphin's dad
![](https://image.tmdb.org/t/p/w92/p3vNUTB35GexppsWMBxqpDpeihS.jpg)
Dayo Wong
Dr. Wong
![](https://image.tmdb.org/t/p/w92/vqVnWFw2ItO1CknThUP25KprrIB.jpg)
Perrie Lai Hoi-San
Whale
![](https://image.tmdb.org/t/p/w92/gy6Z7Yle4MIKOJqCZ0FjcXDFNKc.jpg)
Lau Ching-wan
Joe [cameo]
![](https://image.tmdb.org/t/p/w92/hAXDDF6WFdpDC3c4KfHNgYm4xq2.jpg)
Chang Gan-Wing
Library Cleaner [cameo]