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.�

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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).�