CLASS:y

CLASS:y is a 7-member girl group formed through the MBC survival show My Teenage Girl. The group is managed by K-TIGERS Entertainment for Korean promotions and Universal Music Japan for Japan promotions. The aim of the group is to have potential to chart on the Billboard charts. 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. They made their Japanese debut on June 22, 2022. On November 14, 2025, it was announced that they had left M25 and joined K-TIGERS Entertainment.