
On October 28, Belift announced that Enhypen would release their debut extended play (EP) Border: Day One on November 30. A second trailer titled "Dusk-Dawn" was released three days later, followed by a pair of concept mood boards on October 27. On October 22, 2020, a trailer titled "Choose-Chosen" was posted to Enhypen's YouTube channel, announcing the group's debut in November 2020. 2020–2021: Debut with Border: Day One, second extended play, and first studio album The final line-up Heeseung, Jay, Jake, Sunghoon, Sunoo, Jungwon, and Ni-ki was announced on the live television broadcast of the finale.

On the last episode of the show, seven members were selected out of the nine final contestants, with six chosen by global rankings and one by the producer's choice.
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The series was split into two parts, with the top twelve contestants from the first part advancing to the second. The show aired weekly on Mnet from June 26 to Septemand internationally on Hybe Labels' YouTube channel. Enhypen was formed through the show, which featured 23 male trainees, some of whom were originally from Belift's auditions, while others were transferees from Big Hit Music to Belift. On May 8, 2020, television channel Mnet announced the survival competition series I-Land, as part of the joint venture between the two entertainment companies that "follows the process of next generation K-pop artists being born". Auditions commenced the same month in Seoul, the United States, Taiwan, and Japan, among others locations, seeking male trainees born between 19. In March 2019, Belift Lab (Belift) was co-founded by South Korean entertainment agencies CJ E&M and Hybe Corporation, with plans of creating a new band in 2020.

Career Pre-debut activities and formation through I-Land Similar to how a hyphen connects different words to create new meanings, Enhypen aims "to come together to connect, discover and grow together to form a new act". Etymologically, Enhypen derives its name from the hyphen symbol (-), representing "Connection, Discovery, & Growth". The group's name, Enhypen, was introduced during the live broadcast of the final episode of I-Land.
