Overview
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.
| Actor | Age then | Age now | |
|---|---|---|---|
 | - | - | |
 | 36 | 56 | |
 | 25 | 44 | |
 | 39 | 58 | |
 | 10 | 29 | |
 | 35 | 54 | |
 | 32 | 51 | |
 | 64 | 83 |