CSR (첫사랑/Cheos-Sarang, formerly known as 05class, the name in english meaning first love) is a 7-member girl group under POPMUSIC and RBW Entertainment Japan. The girl group’s concept is a class of young girls who were born in 2005. The group consists of: Sua, Sihyeon, Yuna, Seoyeon, Duna, Geumhee, and Yeham. They debuted on July 27, 2022, with their first mini album, Sequence: 7272. They made their Japanese debut on July 3, 2024, with the mini album, L’heure Bleue.
South Korea