'Mask King' did its usual job of surprising everyone this week when a former 4minute member appeared on the show to perform in front of the audience.

The former member was dressed as a 'Song Machine' and went head to head against another contestant, 'Claw Machine'. The two singers worked together in the first round to sing Kim Gun Mo's "Beautiful Goodbye". Both singers covered the song beautifully and worked together as if they've done it countless times. Accordingly, it was very difficult for the panel and the audience to choose who the winner would be.

The results were in and unfortunately, the former 4minute member wasn't able to get past the first round. The artist lifted her mask to reveal her identity while singing IU's "Friday" which surprised many people as Jenyer (Jiyoon) stood in front of them performing. Jenyer, who is now a solo artist but was mainly known for her rap role in the group, shocked the entire studio with her amazing singing ability. 

Check out the videos above and below!