On this week's episode of 'Mask King', two talented singers appeared to wow the crowd.

SEE ALSO: 'Mood Maker' from 'Mask King' sing Park Hyo Shin's 'Home'!

In the first round, the two singers who go by the name of 'Stingray' and 'Octopus Prince' battled it out by singing Yoon Do Hyun's "It Must Have Been Love". As soon as the instrumental�for the song came on, the panel expressed how much they loved this song. The two singers sang together through their very contrasting voices and style that surprisingly worked well to make the song become loved once again.

Highlight for spoilers:�The identity of 'Octopus Prince' was none other than iKON's Bobby