The police are staking out Park Joon-gil for the murder of Hwang Choong-nam, and jaded detective Jung Jae-gon is being pressured to close the case, particularly by his former superior Moon Ki-beom, who lost his badge for corruption. Joon-gil was once the mob enforcer for Jay Investment, but had fallen out of favor when he embezzled and stole the heart of Kim Hye-kyung, the girlfriend of the company's vice president Park Jong-ho.