Kang Dong-woo, who led a police force corruption probe, is thereafter rejected by his peers and estranged from his family. After relocating to a peaceful rural outpost, he finds himself drawn once more into the shady Gangnam district of Seoul when his daughter's friend named Kim Jae-hee goes missing. Along with broker Yoon Gil-ho and prosecutor Min Seo-jin, Dong-won will reenter the world of vice, narcotics, and corruption in an attempt to unearth a plot that might bring down some of the wealthiest elite in the city.