Jabarkan Eric Tsang - Sam dari Infernal Affairs

Kelly Chen - Dr. Lee Sum Yee

Sammi Cheng - Mary, calon istri Ming

Edison Chen - Lau Kin Ming muda

Shawn Yue - Chan Wing Yan muda

Lam Ka Tung - Inspektur B

Ng Ting Yip - Inspektur Cheung

Dion Lam - Del Piero

Wan Chi Keung - Opsir Leung

Infernal Affairs II - aktor dan tokoh

Edison Chen - Lau Kin Ming muda

Shawn Yue - Chen Wing Yan muda

Anthony Wong Chau-Sang - Superintenden Wong

Carina Lau - Mary, istri Sam

Francis Ng - Ngai Wing-Hau

Andrew Lin - saudara Ngai

Roy Cheung - Law Kai Yin

Bey Logan - Inspektur Calvin

Infernal Affiairs III - aktor dan tokoh

Tony Leung - Chen Wing Yan

Andy Lau - Lau Kim Ming

Leon Lai - Yeung Kwok Wing

Kelly Chen - Dr. Lee Sum Yee

Sammi Cheng - Mary, calon istri Ming

Carina Lau - Mary, istri Sam

Anthony Wong Chau Sang - Superintenden Wong

Edison Chen - Lau Kim Ming muda

Shawn Yue - Chen Wing Yan muda