Please answer the following question: Build a movie plot around this: What does Yoon-jin stare at in the music store? Cello
Answer:
A young woman playing the Ave Maria on a cello; the scene switches to another woman bleeding on an operating table.Hong Mi-ju (Sung Hyun-ah) is watching students play their cellos while their professor grades them. The professor tries to coax her into going to a concert for the little sister of Kim Tae-yeon. Mi-ju declines both the concert and a job offer to become more than just an associate teacher. Mi-ju is confronted by a student who says that because of Mi-ju, her music is for nothing. The student promises revenge. Shaken, Mi-ju drives home and nearly avoids getting into an accident with a truck. At home, she receives a message on her cell phone: "Are you happy? ...You should be."In her attic, Mi-ju sees her elder, autistic daughter, Yoon-jin. Her husband Jun-ki, her sister-in-law Kyeong-ran, and her younger daughter Yoon-hye are also present; everyone but Yoon-jin appears mute and emotionless. Yoon-jin sings "Happy Birthday" to Mi-ju. Mi-ju seems to share a special affection for Yoon-jin. The next day, Yoon-jin stops to stare at a cello in a music store, and Mi-ju buys it for her. Mi-ju meets the new, silent housekeeper, Ji-sook, and begins to teach Yoon-jin how to play the cello. Yoon-hye plays in Kyeong-ran's room until the latter's fiance, Hyeon-woo, shoos her out. Yoon-hye asks Yoon-jin to try the cello, but the normally calm and emotionless Yoon-jin bites her little sister.The same night, Kyeong-ran has a breakdown, as her fiance has seemingly broken up with her. Mi-ju watches the sleeping Yoon-jin, but her daughter's sleeping face suddenly becomes ghastly. In Kyeon-ran's room, a ghost emerges and throws her through the glass balcony door. The rest of the family does not seem to hear a thing. However, Yoon-jin gets out of bed and sees Kyeong-ran strangled and dangling at her window. Jun-ki presents Mi-ju with her old college yearbook, asking why Kim Tae-yeon's pictures are cut out. Mi-ju tells her husband the reason why she quit playing the cello is because of her former friend, Kim Tae-yeon....