The Sheriff in Town (2017)

Dae-Ho (Lee Sung-Min) is a former detective and now considers himself the neighborhood sheriff of where he lives. Jong-Jin (Cho Jin-Woong) is a successful businessman from Seoul that moves to Dae-Ho's neighborhood in Busan. Dae-Ho begins to suspect Jong-Jin is a drug offender and investigates with his brother-in-law Duk-Man (Kim Sung-Kyun).