Kep1er (/ˈkɛplər/; KR:케플러 ; JP:ケプラー) is a seven-member girl group under WAKEONE Entertainment and KLAP Entertainment. The group was formed by the survival show Girls Planet 999.
The members are:
Choi Yujin (최유진), Shen Xiaoting (沈小婷), Kim Chaehyun (김채현), Kim Dayeon (김다연), Ezaki Hikaru (江崎 ひかる), Huening Bahiyyih (휴닝바히에), Seo Youngeun (서영은) .
They debuted on January 3, 2022 originally as 9 in Korea,with the mini album First Impact and in Japan on September 7, 2022.

Kep1er name meaning:Their name combines 'Kep', which means catching dreams, and the number 1, which means the nine girls coming together as one to be the best. It is also a reference to the planet 'Kepler', the Kepler space telescope and inspired by German astronomer Johannes Kepler.

Kep1er Official Fandom Name: Kep1ian (케플리안).

Facts about the members:
Choi Yujin is a former member of CLC (the group disbanded during her activity with Kep1er).
Ezaki Hikaru is a former member of +GANG and trained with the members of XG before being cut from the lineup in 2018.
Kim Dayeon was a contestant on Produce 48.
Shen Xiaoting was a contestant on Produce Camp 2020.

About the former members:
143 Entertainment's (former member) Kang Yeseo (강예서) is a former member of Busters and CutieL,a predebut member of Pritti and now a member of 143 Entertainment's girl group MADEIN.
143 Entertainment's (former member) Sakamoto Mashiro (坂本 舞白) , now a member of 143 entertainment's girl group MADEIN.

About the contract extension:
Kep1er were set to promote for 2 years and 6 months starting on their debut date. Kepler officially debuted on January 3, 2022, with the mini-album FIRST IMPACT. Ahead of their contracts expiration, it was announced that 7 members decided to extend their contracts. The group continued as 7 members after “Kep1going On” promotions, as Mashiro and Yeseo did not renew so they can join 143 Entertainment's girl group MADEIN. Read more on Last.fm. User-contributed text is available under the Creative Commons By-SA License; additional terms may apply.