The Liar and His Lover.

Kang Han-Kyeol is a great yet sullen composer who becomes inspired by the voices of others and keeps his identity secret from people. He meets Yoon So-Rim, a high school student who possesses beautiful singing, whilst under his secret identity, and she falls in love with him. Adaptation of the manga by Kotomi Aoki under the same name, which has been running since 2009.