A developer, Sun Wu-hyun woos investors with a promising ad campaign—a hotel near the mysterious island of Io, where local legends maintain the secret to immortality is locked away. And so too is death for any man that sees it. He is forced to clear his own name, however, when a journalist opposing his plans goes missing. In pursuit of justice, Sun discovers the strange nearby island of Parang, populated almost entirely by women divers, and learns of their rituals, legends, and history. A peculiar riff on The Wicker Man by South Korean cult film legend Kim Ki-young, IO ISLAND is a slow-burning, weirdo thriller that builds to a perverse finale of witchcraft that you must see to believe!