31-year-old single woman Kim Ji-su once wanted to become a famous pianist like Horowitz. Her dream was shattered but she went on by teaching children piano. One day, she discovers a young musical genius, and begins giviving intensive lessons to prepare him for competition. However, while it doesn't turn out, Ji-su is shocked when she realizes that the boy carries a secret that will change her life forever.
Sin Ee-Jae
as Gyung-min
엄정화
as Kim Ji-su
박영서
as Shim Kwang-ho
정인기
as Ji-soo's older brother
김보라
as Min-hee
김희정
as Jeon Kong-ja's mother
Yoo Ji-yeon
as 5th performer (uncredited)
우정국
as Furniture Mover
Choi Sun-ja
as Gyung-min's grandmother
