Kep1er

• Kep1er was formed through Girls Planet 999. The Mnet survival competition featured 99 contestants from South Korea, China and Japan.

• The group was officially formed on October 22, 2021. The nine debut members were announced during the show's finale.

• Kep1er debuted on January 3, 2022. Its first mini album was titled FIRST IMPACT.

• The group's debut song was WA DA DA. The energetic dance-pop track introduced Kep1er's performance-focused musical identity.

• Kep1er originally had nine members. Its debut lineup included six South Korean members, two Japanese members and one Chinese member.

• The group name combines Kep and the number 1. The official explanation associates the name with achieving dreams and becoming one as a group.

• Kep1er's name is also connected to Johannes Kepler. The astronomer's name reinforces the group's space-themed concept.

• The group's official fandom name is Kep1ian. The name was announced shortly before the group's debut.

• Kep1er's official colors are lavender and white. The colors are used in the group's branding and fan-related materials.

• Yujin is Kep1er's leader. She was already an experienced idol after debuting with CLC in 2015.

• Mashiro originally served as Kep1er's co-leader. She supported Yujin in coordinating group activities before leaving in 2024.

• Chaehyun finished first on Girls Planet 999. Her ranking secured her position as Kep1er's center.

• Huening Bahiyyih finished second on Girls Planet 999. She is also the younger sister of TXT member Huening Kai.

• Yujin finished third on Girls Planet 999. Her experience as a former CLC member made her one of the show's most recognizable contestants.

• Dayeon previously competed on Produce 48. She participated in the 2018 survival competition before returning for Girls Planet 999.

• Youngeun finished fifth on Girls Planet 999. She became known for her powerful dancing and versatile vocal abilities.

• Yeseo was a child actress before becoming an idol. She appeared in television dramas and films years before joining Kep1er.

• Hikaru was the Japanese center for the Girls Planet 999 theme song. Her rap and dance performances helped her finish seventh.

• Mashiro trained at JYP Entertainment. She practiced alongside several future ITZY members before participating in Girls Planet 999.

• Xiaoting was a competitive ballroom dancer. Her dancesport background helped her develop graceful movement and strong performance technique.

• Kep1er participated in Queendom 2 in 2022. The group competed alongside established K-pop acts shortly after its debut.

• Kep1er made its Japanese debut in September 2022. The group's first Japanese single was "FLY-UP," featuring "Wing Wing."

• The group's first Japanese studio album was Kep1going. It was released in May 2024.

• Kep1going On was the group's final Korean release as nine members. The mini album featured the title track "Shooting Star."

• Mashiro and Yeseo departed Kep1er in July 2024. Their departure followed the completion of the original project contract.

• Kep1er continued as a seven-member group after July 2024. The remaining members extended their group activities beyond the original contract period.

• TIPI-TAP was Kep1er's first Korean mini album after the 2024 lineup change. It was released on November 1, 2024.

• Youngeun suspended activities in July 2025. She took time away from group promotions to prioritize her health and recovery.

• Youngeun officially departed Kep1er in March 2026. The announcement reduced the group to six members.

• Kep1er released CRACK CODE in March 2026. The group's eighth Korean mini album marked another chapter in its evolving career.