My Daughter Is a Musical Genius

Story:

After my wife died, I became crazy for music and neglected my daughter. After my daughter died in a car accident, I regretted it everyday. With nothing left, I, "Jo Sunhyun," threw myself into the river to meet my family on the other side. But… somehow, I returned to 10 years ago and was able to meet my daughter, "Chaeyoon," again. But what's going on? I think my daughter is a musical genius!