In a small city where redevelopment has stalled, three high school friends struggle with their own obsessions: Yong-gi, a self-styled "attention seeker" dreaming of becoming a superhero; Ji-sook, a "pro-ana" obsessed with losing her weight; and Dumbo, a "netkama" who scams money online by pretending to be a girl. Their fragile friendship unravels when Woo-joo, a charming transfer student and an influencer, shows up. Ji-sook falls for him instantly, while Yong-gi, who has been secretly in love with her, can only watch. But when Woo-joo's real self is revealed Ji-sook starts to collapse, Yong-gi's hidden feelings turn into a dangerous plan for revenge.

Dowoo runs an old motel – adjacent to a lake with thousands of Korean War victims at its bottom – as well as caring for his mother who has dementia. One wintry day she disappears without a trace. In her stead, a cute little dog appears. Everyone helps kind-hearted, somewhat shy Dowoo search for her. However, when his mother isn’t found, rumours arise that he may have killed her. Has he started having doubts himself? It doesn’t help that he swallowed her tranquillisers on the day she went missing, and can’t remember a thing. The disappearance gradually morphs into a disturbing psychological drama. The motel’s appeal to potential suicides, a suspicious kid nosing around, and unexpected visions of horror mean Dowoo’s imagination and reality are increasingly intertwined. What really happened? “A terrifying thing, sunk into the abyss of man,” is the motto Lim Sang-Su gave his first feature film.