The third installment in the popular Infernal Affairs Hong Kong film series. Released in 2003, the film is both a sequel and a semi-prequel to the original film (similar to The Godfather Part II), as it intercuts events prior to and after the original's events. Andy Lau, Tony Leung, Kelly Chen, Anthony Wong Chau-Sang, Eric Tsang and Chapman To reprise their roles again, joined by new cast members Leon Lai and Chen Daoming