Singer Jung Joon Young released an OST for the KBS drama, "Pretty Boy."

This OST song is for the main role played by Jang Keun Suk. There will be two versions of the songs released as well.

The song, "I'm Nobody," will features an American rock style version and a british pop style drama version.

It was revealed that he had worked on the song during his free time last month and made sure to create a solid song.