On 31 January 1968, 31 North Korean commandos infiltrated South Korea in a failed mission to assassinate President Park Chung-hee. In revenge, the South Korean military assembled a team of 31 criminals on the island of Silmido to kill Kim Il-sung for a suicide mission to redeem their honor, but was cancelled, leaving them frustrated. It is loosely based on a military uprising in the 1970s.

Ji-hoon became a wanted man because of betrayal by one of his colleagues. To avoid being arrested by police, he sneaks into a stranger’s house one day. However, what was happening in the house was that wife walks in on her husband having an affair with another woman? Under the absurd situation, Ji-hoo captures them all as his hostage. The hostage captor has become a welcome guest for the wife, Eun-joo. Eun-joo has dropped by her house to take a short break while holding a funeral. However, she finds two unwelcome guests in the house. One is her friend, who is having an affair with the husband. The other one is the hostage captor, a stranger, whom Eun-joo has never seen before. Nonetheless, the hostage captor is on Eun-joo’s side now, who has no one to lean on.

Jin-gyu, an out of work film school graduate, applies for the position of director with pornographic film company Only4Men. The following day he is hired as an assistant director for a production called All Nude Boy, and must become accustomed to working with makeshift locations, impromptu settings, and abuse from the general public. The production's lead actress, Sabine, becomes attracted to him, and the two end up spending the night together after a staff dinner. Later, Jin-gyu gets an offer to work on a real film for a major production company.

A struggling restaurant owner, caring for his sick mom, finds a bag of cash in a sauna locker, while a customs officer gets into trouble when his girlfriend runs off with money he borrowed from a loan shark.