Plot
A whole family is murdered two young daughters, a father, his sister, and a nanny. All five are killed at different times, in different places. The only survivor is Hong Mi-ju, the wife and mother, who observed everything and survived. But she is in shock, and covered in blood, only able to murmur, "I didn't kill them!" She had once been a promising cellist, but stopped her professional career in her university days, choosing instead to teach. She lived the happiest of lives with her kind husband, two lovely daughters, and her sister-in-law, who was like a real sister to her. But all of a sudden, unexpected things started to take place around her. One of her students, Hyun-hee, took revenge on her due to an exam result. Gyung-ran, Mi-ju's future sister-in-law, began obsessing too much about her fiance. A mysterious nanny says that she had tried to commit suicide upon her family's death due to a car accident. And Mi-ju hears a news story about the solo cello concert of He-young, who is a younger sister of her best college friend who died in an accident. Mi-ju gradually feels fear starting to overwhelm her...
