Jun Seol starts a band to get her life back on track. She recently divorced her husband after realizing that she deserved to be treated better by her husband's family. Her band mates are also 'ahjummas' who also have personal problems of their own.

Kim Ji-su (Uhm Jung Hwa) 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 piano. One day, she discovers a young boy Gyung-min (Shin Ui Jae), 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.