
CSR (Cheot-SaRang) [첫사랑]
- Debut (Y-M-D): 22-07-27
- Formerly known as: 05Class
- Label: POP Music Entertainment
- Music Videos:
- Korean MVs: Pop? Pop! (첫사랑), ♡TiCON(러브티콘)
- Albums:
- Korean:
- Single Album: Sequence: 17& (2022)
- Mini Album: Sequence: 7272 (2022)
- Korean:
- Fan Name: Maeum (마음/Heart)
- Logo:

Members:

- Stage Name (Hangul): Geumhee (금희)
- Position:
- Color: Green
- Real Name: Han Geumhee (한금희)
- Birthday (Y-M-D): 05-03-04
- Nationality: Korean
- Height: N/A
- Blood Type: B

- Stage Name (Hangul): Sihyeon (시현)
- Position:
- Color: Light Blue
- Real Name: Hwang Sihyeon (황시현)
- Birthday (Y-M-D): 05-03-12
- Nationality: Korean
- Height: N/A
- Blood Type: B

- Stage Name (Hangul): Seoyeon (서연)
- Position:
- Color: Orange
- Real Name: An Seoyeon (안서연)
- Birthday (Y-M-D): 05-03-26
- Nationality: Korean
- Height: 161cm
- Blood Type: O

- Stage Name (Hangul): Yuna (유나)
- Position:
- Color: Purple
- Real Name: Iimura Yuna (飯村 柚那)
- Birthday (Y-M-D): 05-04-23
- Nationality: Japanese
- Height: N/A
- Blood Type: A

- Stage Name (Hangul): Duna (두나)
- Position:
- Color: Pink
- Real Name: Kang Duna (강두나)
- Birthday (Y-M-D): 05-04-28
- Nationality: Korean
- Height: 164cm
- Blood Type: A

- Stage Name (Hangul): Sua (수아)
- Position: Leader
- Color: Blue
- Real Name: Yoo Sua (유수아)
- Birthday (Y-M-D): 05-07-23
- Nationality: Korean
- Height: N/A
- Blood Type: B

- Stage Name (Hangul): Yeham (예함)
- Position: Maknae
- Color: Dark Pink
- Real Name: Koo Yeham (구예함)
- Birthday (Y-M-D): 05-10-07
- Nationality: Korean
- Height: N/A
- Blood Type: A
Social Media + :
Member:
- Geumhee:
- Sihyeon:
- Seoyeon:
- Yuna:
- Duna:
- Sua:
- Yeham: