CLASS:y.

CLASS:y (클라씨) is best described as a 7-member girl group formed through the MBC survival show My Teenage Girl. Another profile detail is that The group is managed by K-TIGERS Entertainment for Korean promotions and Universal Music Japan for Japan promotions. Additional background says that The aim of the group is to have potential to chart on the Billboard charts. Members include Hyungseo, Chaewon, Hyeju, Riwon, Jimin, Boeun, and Seonyou. Their debut took place on May 5, 2022, with their debut mini album, Y: CLASS IS OVER. They debuted in Japan on June 22, 2022. On November 14, 2025, it was revealed that they had left M25 and joined K-TIGERS Entertainment.