Formation through Girls Planet 999 and other activities Kep1er was formed through the
Mnet reality survival show
Girls Planet 999, which aired from August 6 to October 22, 2021. The show brought 99 contestants from China, Japan, and South Korea to compete to debut in a multinational girl group. Out of initially 99 contestants, only the top nine would make the final lineup. Before the show began, several group members had already been active in the entertainment industry.
Choi Yu-jin made her debut in the
Cube Entertainment girl group
CLC on March 19, 2015, with the group's
extended play (EP)
First Love; she was on hiatus from CLC due to activities with Kep1er until their disbandment. In 2010,
Kang Ye-seo was a member of the girl group CutieL before joining
Busters from 2019 to 2020. Kim Da-yeon participated in
Produce 48 in 2018, representing CNC Entertainment, while Shen Xiaoting participated in
Produce Camp 2020, representing Top Class Entertainment. Both were eliminated in the first round, placing 70th and 80th in their respective shows. Mashiro Sakamoto, a trainee at
JYP Entertainment from 2016 to 2018, appeared in the first episode of the Mnet reality survival show
Stray Kids as part of the female trainee team, but did not progress past the first episode. Following
Produce 48, Da-yeon left CNC Entertainment and signed with Stardium Entertainment, only to leave once more after her debut plans fell through. Xiaoting was a competitive
ballroom and
modern dancer, having won a gold medal in a modern dance sport competition in Shanghai, as well as ranking sixth globally in a British competition.
2021–2022: Debut with First Impact, Queendom 2 Kep1er was originally scheduled to debut on December 14, 2021, with pre-orders for their EP
First Impact having begun on November 29. They were also initially scheduled to perform at the
2021 Mnet Asian Music Awards on December 11. However, it was announced that the group's scheduled debut had been delayed to January 3, 2022, after one of their staff members tested positive for
COVID-19. Their performance at the 2021 Mnet Asian Music Awards was also cancelled. On December 14, it was revealed that group members Mashiro and Xiaoting tested positive for COVID-19 and were announced to have fully recovered on December 26. On January 3, 2022, Kep1er released their debut EP
First Impact, with "
Wa Da Da" serving as lead single. On January 10, Chaehyun was announced as the new co-host for
SBS MTV's music program
The Show alongside
Ateez's Yeosang and
Cravity's Minhee. On January 13, Kep1er won their first music program award on
M Countdown with "Wa Da Da". On February 21, 2022, it was confirmed that Kep1er will participate in the second season of the
Mnet reality competition show
Queendom, scheduled to premiere in March 2022. On June 20, Kep1er released their second EP
Doublast, with "
Up!" serving as the lead single. On August 3, Kep1er released their first Japanese single
Fly-Up, featuring "
Wing Wing" as lead track. It was released on September 7, 2022. On September 23, Kep1er released the promotional single "Sugar Rush" through
Universe Music. On October 13, Kep1er released their third EP
Troubleshooter, with "
We Fresh" serving as the lead single.
2023–2024: Japan tours, first studio album, and contract renewal discussions On February 14, 2023, WakeOne and Swing Entertainment announced the dates for ''Kep1er Japan Concert Tour 2023 'Fly-By'
, which were held in Aichi and Hyogo, the first time that the group held a Japanese arena tour since their debut. On March 15, Kep1er released their second Japanese single Fly-By
, with "I Do! Do You?" as the lead track. On April 10, The group released their fourth EP Lovestruck!, with "Giddy" as the lead single. Kep1er successfully carried out their concert tour by performing in Tokyo at Yoyogi National Stadium on May 20–21, Aichi Sky Expo on June 2–3 and at Kobe World Memorial Hall in Kobe on June 10–11. On July 6, Kep1er released the promotional single "Rescue Tayo" in collaboration with the YouTube children animation channel Tayo the Little Bus. On September 25, the group released their fifth EP Magic Hour
, with "Galileo" as the lead single. On November 22, the group released their third Japanese single Fly-High'', with "
Grand Prix" as the lead track. In 2024, Kep1er held their second Japanese concert tour titled ''Kep1er Japan Concert Tour 2024 'Fly-High''' in
Chiba at the
Makuhari Event Hall on February 23–24, and in Kobe at the Kobe World Memorial Hall on March 2–3. On February 14, WakeOne and Swing Entertainment announced that the group's first Japanese studio album
Kep1going would be released on May 8. Its title track "Straight Line" was released on April 23. On May 13, it was announced that Kep1er would be releasing their first Korean studio album
Kep1going On on June 3 with the title track "Shooting Star" The song was listed on ''
Dazed's
"The 50 best K-pop tracks of 2024" and Billboard's'' "The 25 Best K-Pop Songs of 2024". In September 2023, it was reported that WakeOne was discussing the extension of the group's contract with the members' respective agencies beyond the initial two years and six months contract, which if unsuccessful would have led to the group's disbandment in mid-2024. By January 2024, discussion on renewal of the group members' contracts was reported to still be ongoing. The group's contract was set to expire in July of the same year. On May 30, WakeOne announced that all members of Kep1er, except Mashiro and Yeseo, renewed their contracts. Mashiro and Yeseo departed from the group after the group's concerts in Yokohama, Japan on July 15.
2024–present: Line-up changes On September 30, 2024, Kep1er signed with Klap Entertainment, which co-manages the group along with WakeOne. On November 1, Kep1er released their sixth EP
Tipi-tap, their first release as a seven-member ensemble. On April 30, 2025, Kep1er released their first Japanese EP,
Against the World. On August 19, they released their seventh Korean EP
Bubble Gum. On March 6, 2026, Klap announced member Seo Young-eun's departure from the group. Prior to her departure, Seo had been inactive from the group since July 2025. Kep1er released their eighth Korean EP
Crack Code on March 31, which was their first release after Seo's departure from the group. ==Endorsements==