The King of Mask Singer is a South Korean singing competition television program. Each competition lasts for two episodes, with the singers competing in three elimination rounds. They are given elaborate masks (which are made by designer Hwang Jae-geun) to wear in order to hide their identity. By wearing a mask, spectators vote for the best performer without being influenced by the person's popularity, career or age.
Winners are selected by the audience and a 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 music album consisting of a selection of studio recordings by the competitors.