King of Mask Singer

Format

Each competition lasts for two episodes, with the singers competing one-on-one in three elimination rounds. They 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, both contestants sing the same song, while in the second and third round they each sing a solo song. The winners of each pair are selected by the audience and panel of celebrities through instant live votes. The identities of the singers are not revealed until they have been eliminated. The winner of the third round challenges the previous competition's Mask King, and is either eliminated or becomes the new Mask King. Ha Hyun-woo of Guckkasten ("Music Captain of Our Local") has nine consecutive wins, which is the highest number of wins achieved by any contestant.

Due to great interest and demand, the show released a special album consisting of a selection of studio recordings by the competitors. Despite great popularity, Luna's performances were not included, as her company SM Entertainment reportedly had other plans.

Competitors

List of idol contestants performed in this show, include the ex-idols and exclude the sub-groups (initial sort by group)

     – Idol who has left the group to become a solo artist; their group has been disbanded or was on hiatus.

List of finalists before the Final's battle

The bold winner is the contestant who became the Mask King.

Ratings

In the ratings below, the highest rating for the show will be in red, and the lowest rating for the show will be in blue each year.