[4] Out of the initial 28 contestants, they will compete through performances to finally become a 7-member supergroup, El7z Up (Korean: 엘즈업; RR: eljeueop).

In the teaser, iconic girl group songs play in the background as well as the silhouettes of seven female celebrities are shown.

Along with the confirmation that the first lineup will be revealed in May, the teaser includes the mysterious code on the bottom, "IURP WZHQWB HLJKW WR VHYHQ", which deciphers "from twenty-eight to seven".

[12] On April 26, it was revealed that members Jiwon, Chaerin and Bora from Cherry Bullet would participate in the show.

[15] On May 9, Mnet released a second teaser to officially announce the program's premiere date of June 13, 2023, at 22:00 (KST).

[16] On May 18, Mnet released teaser photos of the first 13 contestants in silhouettes, as well as two teams created, Pick on the top and Pick-Cat.

The two teams also released two theme songs titled "Charismatic" and "Snap" respectively on the same day, accompanied by two performance videos shown on M Countdown.

[17] It was also shared that the rest of the contestants would be revealed the week after, and that they would be releasing and performing the same two songs on M Countdown in their own versions.

[20] On May 25, Mnet released a second set of teaser photos of the remaining 13 contestants in silhouettes, as well as the two teams, Drop The Beat & Athena.

[21] The two teams also released different versions of the two theme songs on the same day, accompanied by performance videos shown on M Countdown.

[28] All of the contestants have previous experiences in the K-pop industry, either as a current or former member of a girl group or as a soloist.

J-Hope) "Weekend" by Taeyeon "If We Ever Meet Again (다시 만날 수 있을까)" by Lim Young-woong "Hopeless Romantic (사랑이라 믿었던 것들은)" by Big Naughty (feat.

Lee Su-hyun) "Wannabe" by ITZY "Time of Our Life (한 페이지가 될 수 있게)" by DAY6