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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.