The program has implemented two different game formats: The winning mystery singer, regardless of being good or bad, gets a reward on the following conditions: In 2012, producer and creator Lee Seon-young planned to develop a singing reality competition show.

[8][9] Also, she originally envisioned a program that will allow anyone to be the main character regardless of their appearances, inspired by Kim Bum-soo who struggled to gain recognition because of his look.

[13] According to a presscon for its sixth season, the game show was referred as a "second coming of National Singing Contest" because of its sudden impact on their local music industry.

[39][40][41] As a prelude to the fifth season, Block B played in the Global Invasion special on January 26, 2018, featuring representative mystery singers from local ICSYV counterparts.

Overall, 23 different members have been assigned as panelists, with their original lineup being Kim Sang-hyuk (of Click-B), Ben, Julian Quintart, and Yoon Sung-ho [ko].