A North Korean diplomat defects to the South during the Cold War, but the South Koreans have their suspicions as to whether he is an actual defector or a double agent.

During a summer vacation, Ok-ju and Dong-ju move into their grandpa's house. While Dong-ju adapts to his new home, Ok-ju feels awkward about this new environment. Once their soon-to-be-divorced aunt also moves in, and as Ok-ju spends time with her family, the house and her grandpa start to grow on her.

While approaching the end of his mundane military service, directionless 24-year-old Joon attempts to sort out his complicated feelings for an older married woman, his ex-girlfriend and her vivacious sister.

Bent on reclaiming a lighter which is his only possession, a broke man pursues the thief, who turns out to be a mob boss planning to hijack a train.