Watch: Highlight's Yang Yoseob Sings His Heart Out For "Ruler: Master Of The Mask" OST

MBC’s historical drama “Ruler: Master of the Mask,” which stars Yoo Seung Ho and Kim So Hyun, will be premiering tonight at 10 p.m. KST.

Ahead of its premiere, the drama has released its first OST song, which is sung by Highlight’s Yang Yoseob, along with a video featuring the talented vocalist. Yang Yoseob’s powerful vocals, paired with the sad lyrics, has created an emotional and dramatic track for OST. Previously, it was announced that Highlight’s Yang Yoseob, Suran, Kim Na Young, and Bolbbalgan4 would be participating in the OST.

The drama is about Crown Prince Lee Sun (Yoo Seung Ho), who fights against members of a corrupt organization who want to privatize the nation’s water supply for their own personal gain. The Crown Prince has to hide behind a mask, for reasons that are still unclear, and attempts to use this to his advantage by trading places with a brilliant but lowly commoner of the same name, who is played by INFINITE’s L (Kim Myung Soo). The two both fall in love with the same girl, Han Ga Eun (Kim So Hyun), complicating their inextricably linked fates even further.

Listen to the emotional track below!

https://www.youtube.com/watch?v=ugehiB8kFQw