Hae-won is a single, middle-aged woman living in Seoul, working at a bank. Her life begins to spiral when she becomes both witness and victim to a violent crime, leaving her psychologically traumatized. Desperate for respite, she decides to visit her childhood friend, Bok-nam, who lives on a remote island. Upon arriving, Hae-won discovers that the island's idyllic appearance hides a harsh reality: Bok-nam is subjected to severe abuse and exploitation by the island’s male residents and some of its female inhabitants as well.

As Hae-won reconnects with Bok-nam, the extent of her friend's suffering becomes increasingly evident. Bok-nam pleads for help, but Hae-won's initial reluctance and detachment prevent her from taking immediate action. Tensions escalate as Bok-nam's desperation grows, leading to a series of harrowing events that force Hae-won to confront the brutality and darkness that grip the island community. The journey delves deep into themes of oppression, injustice, and the strength needed to fight back against insurmountable odds.