Martial Arts Detective: Chinatown(2015)

Original title: 권법형사: 차이나타운

Chinatown is a place where crime and betrayal are rampant. Violent crime detective Ko Jeong-hyeok (Seo Joon-yeong) can't rest a day. He tries to rid the streets of criminals but he's to busy cleaning up his own mess because of his habit of using physical violence first.