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Four high school friends maintain their ties but finds themselves in very different situations when they reach 21. Chu-won was a promising athlete but, drinking heavily and unable to get past an old flame, he ruins his prospects. Goo-rim became on idol singer, but a drug scandal has seen him fall on hard times. Seo-won, as a medical student at a top university, was faring best among them, until he is diagnosed with leukemia and falls for a teenage escort from their old high school. Meanwhile, Dae-sung is a sex addict with a penchant for mature women who dreams of making his own film.

Each night, a homeless girl stays in abandoned houses to get by. In the winter, she leaves the cold environs of Seoul and heads to Busan, eventually finding an empty house in an abandoned part of town. She starts looking for a way to make a living, but it’s difficult to find a job with no home address, no ID card, and no phone number. She ultimately does find work, but her employer takes advantage of her and ends up firing her without paying any wages. No one seems to be on her side in this harsh and abusive world.

The life of runaway girls is exposed to the threats of prostitution or violent situations during the quest to find a place to stay overnight like Eunsoo and Soohyang.