1. Episode 1

Kang Pi-o is known around school as an unrivaled talent — until he meets the mysterious Choi Jeong-yo and realizes he may have finally met his match.

2. Episode 2

With Jeong-yo now his classmate, a bitter Pi-o keeps his distance. But when the two are tasked with a joint performance, Pi-o finds himself warming up.

3. Episode 3

When crisis strikes right before the joint stage, Pi-o improvises a fix — only to wonder if it was a mistake when Jeong-yo's skills outshine his own.

4. Episode 4

With Pi-o determined to reclaim his love for music, Jeong-yo shows Pi-o how to have fun on the piano. Jeong-yo's family troubles catch up to him.

5. Episode 5

Intent on proving himself, Pi-o joins the Prague Harmonie International Competition and asks Jeong-yo to join too. Pi-o's obsessive practice takes a toll.

6. Episode 6

Years later, Pi-o is successful and world-renowned — but miserable. Hong Jae-in tries to let Pi-o know how she feels. Pi-o hunts down news of Jeong-yo.

8. Episode 8

Pi-o faces increasing pressure to do the joint performance, but his issues with the piano only get worse. Jeong-yo finally steps in to help.

9. Episode 9

Pi-o learns the shocking truth behind Jeong-yo's kidnapping. Jeong-yo asks for Pi-o's help with a piano piece, but his harsh words leave Pi-o rattled.

10. Episode 10

Pi-o realizes Jeong-yo has been hiding a huge secret. With everything revealed, Jeong-yo turns even more cruel, and Pi-o falls deeper into despair.

11. Episode 11

As the Korean Symphony’s 80th anniversary concert begins, Jeong-yo and Pi-o face a turning point — but when the performance ends, only one person remains on stage.

12. Episode 12

After painful losses, Pi-o considers leaving music behind, but Jeong-yo shares his final feelings as their last four-hands performance begins.