Bedevilled(김복남 살인사건의 전말)

A series of incidents forces bank clerk Hae-won to take a vacation on the island where she grew up, the socially regressive Mudo. There, she discovers that her childhood friend, Bok-nam, is treated like a slave by the other residents. After a tragic event, Bok-nam finally snaps, leading to a gory bloodbath.