Mi-ju, played by the beautiful Sung Hyun-Ah, is a brilliant cellist who craves peace and stability after surviving a car crash, which killed her best friend. Haunted by terrifying memories of the accident, she decides to forgo a professional career in music, in favor of teaching college students and her daughter how to play. Unfortunately, things begin to go terribly wrong. One of her students attacks her, her sister in-law becomes dangerously obsessed with her fiancée, and the new housekeeper is scaring her to death. Further, there is something very ominous and portentous about the music coming out of her daughters cello.