CLASS:y (클라씨) is a 7-member girl group formed through the MBC survival show My Teenage Girl. The group is managed by M25 for Korean promotions and Universal Music Japan for Japan promotions. The members are Hyungseo, Chaewon, Hyeju, Riwon, Jimin, Boeun, and Seonyou. They debuted on May 5, 2022, with their first mini album, Y: CLASS IS OVER.