The fourth season of the South Korean television mystery music game show I Can See Your Voice premiered on Mnet and tvN on March 2, 2017.
[1][2] 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.
[1] If the last remaining mystery singer is good, they are granted to release a digital single; if a singer is bad, they win ₩5,000,000.
Also in that season, a first postseason showcase was aired one week after its finale, which includes the mystery singer performance rankings for the past seasons, as well as an encore concert featuring some of invited guest artists and mystery singers return to perform one last time.
[44] Sources: Nielsen Media Research and TNmS [ko]