The group consist of Hyeonju, Nana, Gehlee, Kotoko, Yunha, Elisia, Yoona, and Seowon.

[2] Unis was formed through the SBS reality survival show Universe Ticket, which aired from November 18, 2023, to January 17, 2024.

[3][4] The show brought 82 contestants from around the world, primarily in South Korea, Japan, China, Thailand, Myanmar, Vietnam, the Philippines, and Canada, to compete to debut in a multinational girl group.

In 2017, Hyeonju was a member of the girl group Good Day under the name Lucky,[6] and competed in The Unit: Idol Rebooting Project.

][10] and went onto make her official debut as a soloist on April 24, 2021, with the release of her first digital single, "Shoulder Dance".