In 2019, J Planet Entertainment opened SNS accounts for their new upcoming girl group 05Class, then consisting of members Sua, Seoyeon, Yeham, Dahyun and Taehee; however, Dahyun and Taehee departed from the group in February 2020. Following their departure, Geumhee was added to the lineup in April 2020, followed by Duna in December 2020. In 2021, they were transferred to Pop Music.
On January 7, 2022, they introduced two new members, Sihyeon and Yuna. Later in July, Pop Music was acquired by A2Z Entertainment, thus they were transferred again. During this period, Yoonjung, Gaeun, Sona, and Naeun were also added to the lineup, but all four withdrew shortly after being added.
On July 8, 2022, the group's name was revealed to be 첫사랑 (CSR), meaning “first love”, and the group's official SNS accounts were opened. It was also determined that the group would be debuting under A2Z Entertainment instead of J Planet Entertainment. In the following days, two debut trailers were released, before a schedule poster, posted on July 11, confirmed the release of their first mini album Sequence : 7272, scheduled for July 28.
The group debuted a day prior with the release of the music video for the title track, "Pop? Pop! ".
On October 26, A2Z Entertainment announced that the group would make their first comeback on November 17. Around a week later, on November 6, 2022, a schedule teaser was released, revealing the comeback to be a single album called "Sequence : 17&". On November 17, they revealed their fandom name to be "Maeum".
On December 2, the group received their first music show win on Music Bank with "Loveticon (♡TiCON)". On March 13, 2023, EDAILY reported that CSR will return with a new mini-album later this month. The next day, CSR revealed that their second mini album, Delight, would be released on March 29.
On July 27, it was announced that Sua would be stepping down as leader and Duna would become the leader of the group going forward. On November 17, it was announced that CSR would released their first digital single "HBD To You (Midnight Ver. )" on November 26.
On December 17, the group released their second digital single "HBD To You". On December 22, A2Z announced that members Geumhee, Seoyeon, Duna and Yeham would be going on hiatus from group activities due to their overseas schedules. On May 26, 2024, the group released a teaser for their upcoming comeback, which was set to be released on June 11.
On May 29, the group announced their plans to release their second single album "L'heure Bleue : Prologue" on June 11 and release their debut Japanese mini album L'heure Bleue on July 3. On March 11, 2025, it was announced that CSR would be participating in the survival show A-IDOL. However, for unknown reasons, Sihyeon didn't participate in the show.
On October 13, a teaser poster for Red Soda Circle were unveiled. It was later revealed that members Yuna and Yeham, going by Rina and Haru would be opening a YouTube channel on October 20 and start unit activities. On February 13, 2026, Seoyeon revealed in a livestream that they would be performing their new song for the first time at their Japan concert.
On March 18, a new song by CSR, titled "숨길 수 없는 맘인걸", was approved for broadcast by KBS. On March 24, the group started teasing the special digital single, scheduled for March 26.
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