Check out Highlight Yoseob's self-composed OST teaser for 'Monarch - Owner of the Mask'
Highlight'sYoseob will be singing a second OST for 'Monarch - Owner of the Mask'!
He already sang "I Couldn't Cry Because I'm a Man" for part 1 of the OST, and he'll be lending his voice to the drama again through Part 7, titled "Tree".