You're Pretty, Oh Man Bok (2014)

Oh Man Bok lost her mom an her dad abandoned them when her mom was pregnant with her. Her new family over her as their own, and her siblings love her a lot as well. They make sure that she never feels lonely and a part o the family. One day she hears a song on the TV, the song her mom used to sing to her, she knew that the song was meant for her mom. She decides to find the man who wrote the song in order to find his real dad.