During this week's episode of 'Mask King', the individual behind the 'Parrot' mask shocked the panel and the audience of the show.

For the first round, 'Parrot' and 'Flamingo' sang a duet together to perform Bon Jovi's "Always" which caught the panel off guard as the song is considered as one of many legendary songs sang by the artist. The two sang with each other very well as if they have been practicing together for weeks.

After the performance, the identity of 'Parrot' was revealed to be none other than BTOB's Hyunsik. Many did not expect the singer behind the mask to be the idol and could not help but be surprised. Hyunsik and his fellow members from BTOB are known to have extremely strong voices in which transcends to their performances on a consistent basis. 

Check out his solo performance below!

SEE ALSO: BTOB's Sungjae sings for Gummy on 'Fantastic Duo 2'