In unified Korea, the land is separated from the polluted sea by a massive wall. Beyond this barrier, exiled mutants known as the "Omegas" are cheaply exploited as laborers, forced to clean the ocean. Sujin, a young civil servant tasked with managing the Omegas, grows suspicious of Mia, an employee at an indoor fishing center. Driven to uncover Mia's true identity, Sujin begins her pursuit...

The dreams of those who vanished into the sea drift down the rotting hallways of the Unified Korea. The Siren's voice resounds through the cracks of locked doors before transforming into a massive clamor. Set in the near future, the film The Fin explores the complex process of how horror is transformed and new myths are created.

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