CSR.

K-Pop

CSR (첫사랑/Cheos-Sarang, formerly known as 05class) is a 7-member girl group managed by POPMUSIC and RBW Entertainment Japan. Another profile detail is that The girl group’s concept is a class of young girls who were born in 2005. The lineup includes Sua, Sihyeon, Yuna, Seoyeon, Duna, Geumhee, and Yeham. Their debut took place on July 27, 2022, with their debut mini album, Sequence: 7272. They debuted in Japan on July 3, 2024, with the mini album, L’heure Bleue.