Hae-won is a beautiful single woman in her thirties who works at a bank in Seoul. She leads a busy life until she becomes a witness to an attempted murder case, and at the same time, things get complicated at work. When things get out of hand she is forced to take a vacation so she heads for Moodo, a small undeveloped island, which she had once visited to see her grandparents. And where she had befriended a girl named Bok-nam who still writes to Hae-won asking her to visit despite the fact that Hae-won never bothers to reply.

Upon arriving at the island, Hae-won is shocked to see everyone treating Bok-nam like a slave. As practically the only young woman on the island, she is a plaything for all the men and a free laborer for the women. Sick of all the inhumane treatment, Bok-nam has tried to escape the island several times in the past but failed each time. She begs Hae-won to help her escape the place, but Hae-won remains indifferent not wanting to be involved in complicated situations. When Bok-nam realizes that her own daughter will follow her footsteps, she tries to escape the island with her daughter. But her daughter gets killed in the process. And when she loses the only thing that had kept her going because of Hae-won's negligence, Bok-nam takes a sickle in her hand for revenge.