The Viral Factor

Jay Chou

Jon

Nicholas Tse Ting-fung

Man Yeung

Lin Peng

Rachel

Michelle Bai

Ice

Andy On Chi-kit

Sean

Liu Kai-chi

Man Tin

Carl Ng Ka-lung

Ross

Sammy Hung Tin-chiu

Mark

Keung Ho-man

Russell

Crystal Lee

Champ

Elaine Jin Yan-Ling

Jon's Mother

Deep Ng Ho-hong

Man Yeung's Former Partner

Zhang Ran

Wang Xiaojie

Jess Teong

Rachel's Mother

Thomas Cheung Kwok-Leung

Russell's Henchman