According to original South Korean rules, the guest artist(s) eliminate mystery singers at the end of each round, with the last remaining mystery singer ended up in a duet performance by one of the guest artists.[a]
If the last remaining mystery singer is good, they are featured in a post-show privilege video; if a singer is bad, they win Rp 17,500,000.
Rounds
Visual round
The guest artist is given some time to observe and examine each mystery singer based on their appearance. Afterward, a muted video of each mystery singer that reveals only 0.3 seconds of their singing voice is played as an additional hint.
Lip sync round
Each mystery singer performs a lip sync to a song; good singers mime to a recording of their own, while bad singers mime to a recording by someone else.
Evidence round
A proof of each mystery singer's singing ability (i.e. photo, video, certificates, etc.) is shown on the screen. Good singers have own evidences, while bad singers had their evidences fabricated.
Episodes
Guest artists
This section is missing information about the real names of mystery singers. Please expand the section to include this information. Further details may exist on the talk page.(November 2024)