What film noir starring Lee Jung-jae shows the conflict between the police and the mob?
Lee Jung-jae:  Brothers" (2003), action films "The Last Witness" (2001) and "Typhoon" (2005), heist film "The Thieves" (2012), film noir "New World" (2013), and period film "The Face Reader" (2013). New World (2013 film):  Starring Choi Min-sik, Hwang Jung-min and Lee Jung-jae, the film shows the conflict between the police and the mob through the eyes of an undercover cop.
New World