Pre-debut: Background and formation through Queendom Puzzle All members of El7z Up have previously made their debuts in other girl groups.
Kei debuted as a member of
Lovelyz in 2014,
Yeeun debuted as a member of
CLC in 2015, both of whom also debuted as soloists in 2019 and 2023 respectively. Yeoreum debuted as a member of
WJSN in 2016 and as a member of WJSN's first subunit WJSN Chocome in 2020. Yeonhee debuted as a member of
Rocket Punch in 2019.
Nana and Yuki debuted as a member of
Wooah and
Purple Kiss respectively in 2020. Hwiseo debuted as a member of
H1-Key in 2022. El7z Up was formed through the reality competition show
Queendom Puzzle, which aired from June 13 to August 15, 2023. The show brought together twenty-eight active female idols to form a supergroup consisting of seven members. On July 25, during the seventh episode, the name of the group was revealed. During the finale, the final seven members of the group were announced, along with the aim of a September debut later that year. Before appearing on the show, Kei participated in the first season of the show's legacy series
Queendom as part of her group Lovelyz. Yeoreum also participated in the second season as part of her group WJSN, where they finished in first place.
2023–present: Debut with 7+Up, and 2023 MAMA Awards On September 14, 2023, El7z Up made their debut with the EP
7+Up, along with its lead single "Cheeky". On November 29, El7z Up appeared and performed at the
2023 MAMA Awards. On December 5, 2023, it was reported that El7z Up will be releasing a new album in early 2024. Subsequent reports on February 26, 2024, indicated release date set in May. The group was also scheduled to perform a new song from the album at
KCON Japan 2024. However, both their appearance at KCON and the album release were ultimately cancelled. ==Members==