Competitors are given elaborate masks to wear in order to conceal their identity, thus removing factors such as popularity, career and age that could lead to prejudiced voting. In the first round, a pair of competitors sing the same song, while in the second and third rounds they each sing a solo song. After the First Generation, the winner of the Third Round goes on to challenge the Mask King, and is either eliminated or replaces the previous Mask King through live voting. The identities of the singers are not revealed unless they have been eliminated.
Kim Sung-joo
Self - Host
Kim Gu-ra
Self - Panelist
Shin Bong-sun
Self - Panelist
Lee Yoon-suk
Self - Panelist
Kim Hyun-chul
Self - Panelist
Yoon Sang
Self - Panelist
Kai
Self - Panelist
Kim Ho-young
Self - Panelist
Lee Chang-min
Self - Panelist
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