Bok-soon manages to make a living by running a street stall at the local market with her younger sister Eun-jeong, whom she loves more than life itself.

Their relatively peaceful life is disrupted when Tae-soo, who lives alone in a deserted forest, kills Bok-soon's beloved sister because Eun-jeong may have stumbled upon the truth of his murderous lifestyle.

Despite her limited mental ability, she begins planning her revenge, and joins up with Na-ri, a little girl who is being chased by Tae-soo, after he killed her elder sister Yeon-Hee.

Bok-soon finds Tae-soo just then, and a deadly battle unfolds between this frail but strong young woman and the bemused, ruthless killer that ruined her life.

[12][13] This negative criticism seemed to affect its early run, drawing 88,995 viewers on its opening weekend, behind Thread of Lies and 300: Rise of an Empire.