Can you hear me?

Marissa, a five year old musical prodigy who lives in the States with both of her parents suddenly has to move back to Korea when her father dies. Her mother who didn't know what to do quickly remarried to a man with a son three years older than Marissa. She was soon renamed her korean name Seah to go along with her new step brothers name Sehun who also happens to take musical lessons. Even though Sehun is very jealous of his new sister he learn to really love her but keeps it a secret. To Sehun she's very annoying because anything he does she does it ten times better and she follows him everywhere. But a lot changed after that day.... the day after her 12th birthday.
Now six years later Sehun is in a kpop group and comes across trouble with his sister again.

1. New mom

2. SM trainee's

3. The day sound died

4. New neighbor

5. A misunderstanding

6. Crying out

7. Overheard

8. For three days

9. Beethoven

10. Secret

11. Why?

12. Who?