Mark Wahlberg portrays Detective Danny Wallace, a rookie cop assigned to the Asian Gang Unit of the NYPD, where he partners with Lieutenant Nick Chen.
Chow Yun-fat plays Lieutenant Nick Chen, the head of the Asian Gang Unit who balances the line between upholding the law and the demands of Chinatown's criminal factions.
Byron Mann takes on the role of Bobby Vu, a member of the Fukienese Dragons, a gang involved in Chinatown's underworld.
Kim Chan is cast as Benny Wong, a powerful figure within Chinatown and a character with significant influence over local organized crime.
Ric Young appears as Henry Lee, a character intricately linked to the criminal activities in Chinatown.
Paul Ben-Victor plays Schabacker, an FBI agent with his own agenda in the investigation of Chinatown's crime scene.
Jon Kit Lee takes the role of Jack, a key member of Chinatown's criminal gang.
Andrew Pang portrays Willy Ung, one of the characters involved in the tangled web of gang affiliations in the movie.
Elizabeth Lindsey plays Louise Deng, a character who interacts with the main cast within the film's depiction of Chinatown.
Brian Cox portrays Sean Wallace, a figure in the film who is tied to the broader aspects of law enforcement.
Bill MacDonald appears as Vince Kirkpatrick, a character involved in the law enforcement community of the film.
Tovah Feldshuh is cast as Margaret Wheeler, an individual who brings her own dynamics to the interplay of characters within the film.
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