Currently, the idol actor is playing the character Lee Sun in the new drama. On May 16, Woolim Entertainment revealed that L will also be lending his voice for the drama OST. The title and the release date of the track are not yet confirmed.
The OST will reportedly be a ballad track depicting Lee Sun's heart aching love for Han Ga Eun or actress Kim So Hyun.
'Monarch - Owner of the Mask' airs every Wednesday and Friday at 10 p.m. (KST).