This film had so much promise to be great. It was getting there but fell at the final hurdle. The conclusion was extremely poor in the way that Bok-nam never got her full vengeance, died, and Hae-won got to undeservedly, live.
Hae-won ultimately came out of the movie completely unscathed, despite being the worst friend in the history of humanity. Hae-won deserved to die because of her consistent level of inaction and callous indifference towards poor Bok-nam. Hae-won's bloody and justified death would have been the icing on the delicious cake of revenge instead of a shit sandwich which her survival became.
There is no clue in the beginning about what is to come. One first suspects that Hae-won (Ji Seong-won) is going to be a victim as she witnesses an attempted murder. The stress of that causes problems at work, so she is forced to take a vacation.
She heads to the island where she used to live with her friend Bok-nam(Seo Yeong-hee). Bok-nam's live is a living hell. Her husband beats her and takes all the money she earns to use on prostitutes, her brother-in-law rapes her repeatedly, and the old island women use her as a slave. She wants desperately to leave with her daughter before she is subjected to the same abuse.
Things go from bad to worse before everything gets extremely bloody.