CLASS:y (클라씨) is a South Korean girl group formed through the MBC reality competition show My Teenage Girl (TeenageGirls) under M25 and Universal Music Japan. The group consists of seven members: Hyungseo (형서), Chaewon (채원), Hyeju (혜주), Riwon (리원), Jimin (지민), Boeun (보은) and Seonyou (선유). They officially debuted on May 5, 2022, with the extended play (EP) "CLASS IS OVER. On May 26, 2022, CLASS:Y released their second series of their debut extended play, "LIVES ACROSS". On May 10, 2022, they announced they will make their Japanese debut with the single "Shut Down -JP Ver.-" on June 22. On September 20, 2022, it was confirmed that CLASS:Y will make a comeback with a new album on October 26, 2022. It was released on October 26, 2022 with the only two tracks, "TICK TICK BOOM" and "ZEALOUS", serving as the album's double title tracks. In November 2022, it was announced Classy would release a Japanese album in January 2023. On December 21, it was announced that CLASS:Y will return with their second Japanese single titled "TARGET" and hold their first fan concert in Japan in February 2023. On February 7, it was announced CLASS:Y would be a contestant in their third survival show, "The Next - Battle of The K-Pop Girl Groups".