Boo Dang Geo Rae (The Unjust) (2010)

The sudden death of an accused child killer while in police custody prompts an unethical detective and a desperate mob boss to frame another convict who may be innocent of the crimes, only to find their scheme complicated by an unusually thorough public prosecutor in this tense crime thriller. When a depraved serial killer says 5 South Korean children, the present gets directly involved with the case led by veteran detective Choi Cheol-gi. Frustrated over the fact that his stellar arrest record was marred by the fact that he was set-up for a crime and demoted, Choi manages to apprehend the prime suspect, who soon dies under police supervision. But Choi isn't about to see his career destroyed by such a freak accident, and quickly cuts a deal with mafia don Jang Seok-gu to find a patsy. Before long Choi and Jang have their fall guy, but when public prosecutor Ju Yang takes the case, the president attempts to have Choi taken off the case. Later, as the investigation intensifies, the complex web of lies and deceptions threatens to ensnare everyone involved. ~ Jason Buchanan, Rovi