They are from an audition program called "I-LAND" (June 26 - September 18, 2020). twenty-three people were selected as a participant in the audition. Then, seven people were chosen by voting from producers and fans all over the world in about three months, and their debut was decided. On September 19, they opened official social media, for example, Twitter, Instagram, and so forth. They announced their fan name on October 8. Then, their membership opened on October 12. On October 28, their first album, BORDER : DAY ONE was announced. Their first reality show that was shown until their debut started on November 11. On November 30, they finally debuted and released the first album. They appeared at Mnet Asian Music Awards on December 6.