City of Fathers (2009)

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Kang Su is an alcoholic and a chronic gambler. He has also never been a proper father to his rebellious teenage son Jong Cheol. For 18 years, Kang Su has also held a secret from Jong Cheol - that he's not his actual biological father. Jong Cheol's real father, Tae Sok, is a pimp that abandoned love for success. Now, to save his son, Kang Su must go to Tae Sok...