Infernal Affairs II is a 2003 Hong Kong crime-action film directed by Andrew Lau and Alan Mak. It is a prequel to the 2002 film Infernal Affairs. Anthony Wong, Eric Tsang, Edison Chen, Shawn Yue and Chapman To reprise their roles from the original film alongside new cast members Carina Lau, Francis Ng, Hu Jun and Roy Cheung. Neither Andy Lau nor Tony Leung, who played the central roles in the original, appear in this film as they are replaced by their younger versions portrayed by Chen and Yue respectively. The events of the film take place from 1991 to 1997. It was followed by Infernal Affairs III (2003), which is both a sequel and a semi-prequel to the original film. Plot In 1991 Hong Kong Police Force Superintendent Wong Chi-Shing meets his Triad informant, Hon Sam. Meanwhile, Lau Kin-Ming, who is due to become Hon's prospective spy within the Hong Kong Police Force, assassinates Hon's Triad boss, Ngai Kwun, in a mission for Hon's wife, Mary, who wants Hon to rise up the triad ranks. Mary tells Lau to keep her order secret from all, including Hon. With Kwun dead, the Big Four triad underbosses intend to stop paying their dues to the Ngai family, but Kwun's successor and son Ngai Wing-Hau manipulates them to continue by blackmailing them on their mutual betrayals. As Lau enlists in the police academy, another police cadet, Chan Wing-Yan, is fired from the academy upon the discovery that he is also a (illegitimate) son of Kwun's, despite his dissociation with the Ngais. The police tell Chan to meet Wong, who enlists Chan as an undercover cop after Chan relays his purpose of being a righteous man. Chan is imprisoned on fake criminal charges to get close to one of Hon's men, Keung, whom Chan helped arrest previously. In 1995 Lau has risen as a rookie cop, due to tips on criminal dealings from Hon. Meanwhile, Chan has become a small-time gangster after his and Keung's release from prison. Chan's girlfriend aborts their baby due to his gang association. Hau invites Chan to join the Triad, then tells the Big Four and Hon that he wants to emigrate, leaving them the Hong Kong underworld. Hau sends Hon to Thailand to link up with Thai cocaine smugglers, Hon leaves despite Mary's warning of a trap. Mary meets Wong; it is revealed that Wong ordered her