Before the first episode was aired on April 7, 2017, it was revealed that three trainees have left the show: Han Jong-youn (Maroo Entertainment) left the show after a bullying scandal, while trainees Kim Shi-hyun (Choon Entertainment) and Nam Yoon-sung (I.One Entertainment) left due to health reasons.
Sebelum episode pertama ditayangkan pada 7 April 2017, terungkap bahwa tiga peserta telah meninggalkan acara: Han Jong-youn (Maroo Entertainment) meninggalkan acara setelah skandal bullying, sementara trainee Kim Shi-hyun (Choon Entertainment) dan Nam Yoon-sung (I.One Entertainment) meninggalkan acara karena alasan kesehatan.