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After a car accident in the mountains, Oh Gwang wakes up in Mr. Jang's house. Oh Gwang, a vicious real estate agent, finds himself rescued by the Jang family who are isolated from society due to heavy rains that cut them off everything, including landlines. The Jangs try to stop Oh Gwang who is in a hurry to leave in order to settle a developing contract. However, he leaves the house anyway and hurts himself. Despite their kindness, the family seems to be hiding from him. Little does he know that a vicious deed from his past involves the family and he's not as safe with them as he seems.

Young Do, whose father was a merciless murderer, had to endure being called ‘monster’ ever since he was a child. His father’s dark shadow is constantly drawn over him despite his death by execution. Young Do vindictively lashes out to those calling him a monster, slowly becoming one himself. One day, a mysterious woman with a child shows up at Young Do’s house, claiming his father murdered her parents. When she demands his heart, Young Do points a knife at his chest, daring her to stab him. He eventually fails to kick the woman and her child out of his house, and adding to this, he learns of a secret of hers.

Wracked with guilt over the suicide of her sister Ai, who was tormented by high school bullies, pretty young karate student Megu accompanies a group of older friends on a camping trip into the woods: smart girl Aya, her druggie...