The Accidental Gangster and the Mistaken Courtesan

Ace fighter and trouble magnet Chun Doong (Lee Jung Jae) falls in love at first sight with enchanting gisaeng Seol Ji (Kim Ok Bin) but alas, their rendezvous is too brief as her underworld-connected boss Man Deuk (Kim Suk Hoon) warns him off and whisks her away. Still pining after Seol Ji, Chun Doong unexpectedly becomes the new boss of the Jakgwi gang when he accidentally kills the gang's head. As luck would have it, all the big bosses of the region are soon called together for a pow wow at Man Deuk's bar. Chun Doong uses the opportunity to rescue Seol Ji from Man Deuk's grasp, setting off a huge riot and gang war in the process. (official distributor synopsis)