Andy Lau

~ as ~

Dr. Ko / Derek Hui

Charlie Yeung

~ as ~

Tse Yuen Sam

Charlene Choi

~ as ~

Zi Qing

Anthony Wong

~ as ~

Dr. Lip

Lam Suet

~ as ~

Ko's Colleague

Andrew Lin Hoi

~ as ~

Benz Hui Siu-Hung

~ as ~

Zi Qing's Father

Teddy Lin

~ as ~

Joe Cheung

~ as ~

Sasha Hou Sa-Sa

~ as ~