Kim Ji Su is a 31-year-old single woman who once wanted to become a famous pianist like Horowitz. Her dream was shattered but she was able to go on by teaching children to play the piano. One day, she discovers a young boy, Gyung Min, who is a musical genius. She starts to give him intensive music lessons, preparing him for competition, but it does not turn out well. But later, when all seems lost, Ji Su is utterly shocked when she realizes that Gyung Min carries a secret that will change her life forever.