Format According to the
original South Korean rules, the guest artist must attempt to eliminate bad singers during its game phase. At the final performance, the last remaining mystery singer is revealed as either good or bad by means of a duet between them and one of the guest artists. The winning mystery singer, regardless of being good or bad, gets 3,000
лв and will have to perform again at the encore concert.
Rounds {{olist|
First impression () 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. The guest artist must describe one of the mystery singer's other talents, except "singing" itself. It may unrelated to the stage of truth, but it depends on their identity. ==Episodes==