Infernal Affairs II is a 2003 Hong Kong crime-action film directed by Andrew Lau and Alan Mak.

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.

Hong Kong Police Force Senior Inspector Wong Chi-Shing meets his Triad informant, Hon Sam.

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.

When she rejects his romantic advances and attempts to travel to Thailand for Hon, Lau anonymously betrays her to Hau's men, who kill her at Kai Tak Airport.

Wong admits guilt of conspiracy to murder to an internal investigation, but the department clears him so that he can take down the increasingly powerful Hau.

Wong persuades Hon to return to Hong Kong to testify against Hau, as revenge for Mary.

Paul insists on executing the Ngai family to tie up loose ends, despite Hon's reluctance.

The film was highly anticipated prior to its release due to the success achieved by Infernal Affairs.

[2] The film grossed HK$24,919,376[3] — big by 2003 Hong Kong standards, but only about half of the original's earnings.

Although Infernal Affairs II earned twelve nominations for the 2003 Hong Kong Film Awards, it could not match its predecessor's success.