Sung-chul (Park Joong-hoon), a Korean gangster, flees to Japan after killing a subordinate. On the flight, He-gu (Park Sang-min), an aspiring bartender, discovers his true identity and is forced to act as his guide. Despite multiple betrayals and brushes with death, the two form an uneasy bond. As Sung-chul rises through the ranks of the yakuza, He-gu too is drawn into the criminal underworld. Clumsy but determined, He-gu survives power struggles, betrayal, and heartbreak—only to make reckless decisions that ultimately lead to chaos. In the end, Sung-chul is ordered to eliminate He-gu. At the seaside, after one final plea for mercy, He-gu is shot dead by Sung-chul, who walks away silently.

A man with no ambitions or scruples, upon his release from prison, meets a former classmate who has fallen on hard times and has lost his will to try to better himself and his life.

Jang Choon-dong is a traffic officer who aspires to become a homicide detective. He is assigned to go undercover to infiltrate a gangster network. Meanwhile, Lee Joong-dae, a member of Kwang-seob's gang, goes undercover himself by joining the police force. Joong-dae tries hard to gain favor with his squad leader in an effort to expose Choon-dong's identity.

Burnt-out transit cop Jay forms an unlikely alliance with pickpocket Kay to stop a terrorist hijacker from blowing up a subway car during rush hour.