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).—Asianwikidotcom

Disgraced by a failed drug sting operation, ex-cop Dae-ho settles in Busan as the unofficial sheriff of the town. When a new businessman named Jong-jin arrives and gains the favor of the townspeople with plans to build a beach resort, Dae-ho becomes suspicious. Soon, he sees a possible connection between Jong-jin and his failed undercover operation.