Entry test

Trainees must perform a song either in the small groups in which they arrived or alone if they arrived as such. The contestants already present raise their hands to decide whether the new arrivals are worthy to be in the I-Land. If a trainee receives 12 or more votes, they are allowed to be on the I-Land; otherwise, they will be on the Ground. There is no limit to the number of times any one trainee could raise his hand. However, if more than 12 contestants were voted to the I-Land after the entry test is complete, they must choose one or more to be moved to the Ground until only 12 remain.

Color key

•   I-Land
•   Moved Out^{[lower-alpha 3]}
•   Ground

Theme song

The trainees, who are only just getting to know each other, begin their first official mission with the theme "encounter". The I-Landers and Grounders must perform the show's theme song "Into The I-LAND" (original version by IU). There are 12 parts in the song, and each trainee chooses which part they want to perform. The I-Landers are evaluated individually by the producers and directors, and the entire group's average score determines the number of contestants who move out of the I-Land.^{[lower-alpha 6]} The Grounders each submit a daily performance video to be reviewed by the producers and directors to determine who will replace the demoted I-Landers, although they do not actually perform on stage.

Lee Hee-seung is appointed as leader and assigned the part 1 position by the contestants but later gives up both to Ni-ki. Rain evaluates their performance two days before their performance. The I-Landers receive an average score of 59 and therefore choose six contestants to be moved out of the I-Land.

Color key

•   Contestant from the I-Land later moved to the Ground

Teamwork

The trainees' second mission is designed to test and develop their teamwork. Both the I-Landers and the Grounders must perform a remix of "Fire" by BTS, and are given six days to prepare. The scoring system from the theme song mission will be used; however, the highest individual scoring I-Lander is given a dropout exemption card, which can be used on any of the I-Landers, including himself. If the card is used, the next dropout candidate will automatically be demoted to the Ground. If there are no dropouts from I-Land in this round, the Grounders will not be able to perform at all.

Jay and Ni-ki become the leaders of the Grounders, while Lee Hee-seung is the leader of the I-Landers. Two days before the test, Rain and DOOBU evaluate the Grounders, and Zico, Pdogg and Son Sung-deuk evaluate the I-Landers as a midpoint check. The I-Landers receive a teamwork score of 80 and an average score of 78 and therefore choose four contestants to be moved out from the I-Land. Having received the highest individual score, K uses his dropout exemption card to save Yang Jung-won, and Ta-ki moves to the Ground instead. Both received five votes; however, Ta-ki's higher individual score initially saved him from being dropped.

•   Contestant from I-Land that received the highest score thus received the dropout exemption card
•   Contestant that eventually stays in I-Land
•   Contestant that later moved from I-Land to Ground
•   Contestant that later moved from Ground to I-Land
•   Contestant that eventually stays in Ground

Representative Unit

The trainees' third mission involves picking representatives for vocal and dance battles between the I-Landers and Grounders to test their sacrifice and ability to directly compete. If the Grounders win, six contestants will be dropped from the I-Land. If I-Landers win, no contestants will be dropped. The trainees are given six days to prepare.

Rain and Son Sung-deuk evaluate the I-Landers, and Zico, Pdogg, and DOOBU evaluate the Grounders as a midpoint check, three days before the test. The I-Landers won the battle; therefore, no I-Landers were moved to the Ground.

•   Win
•   Lose

The Final 12

The fourth and last mission of the first part of the show decides the final 12 contestants. The trainees must perform an original song titled "I&credible" with the theme "Awakening". Similar to "Into the I-LAND", there are 12 parts, and each trainee must choose which part they want to perform. They are given seven days to prepare.

Rain and Son Sung-deuk evaluate the Grounders, and Zico, Pdogg, and DOOBU evaluate the I-Landers as a midpoint check. Jay and Jake help the I-Landers with the details of the choreography, and Ni-ki helps the Grounders. From the I-Land, three contestants are voted out by the I-Landers themselves, and another three from the producers. Six trainees from the Ground, including the demoted I-Landers, are selected to fill the six remaining spots in the I-Land by the global fans through voting. The six remaining I-Landers automatically advance to the second part of the show. After the eliminated I-Landers arrive on the Ground, they must perform again with the Grounders, and they are given three days to redistribute parts and prepare.

I-Landers K, Lee Hee-seung, Park Sung-hoon, Yang Jung-won, Jake, and Jay were saved from being dropped to the Ground and therefore will continue on the second part of the show.

  Contestants that later moved from I-Land to Ground

• Kim Yoon-won withdrew from I-Land due to a worsening leg injury.

BTS Test

The first test of the second part of I-Land and the final 12 contestants is performing songs by BTS. The 12 contestants are divided into three units, with each one performing a different song. BTS announced the mission themselves in a message recorded from the living room of the I-Land complex while the contestants watch from the lobby. The producers choose a contestant who will be eliminated based on individual scoring. The unit with the highest team score will be exempted from elimination; if the contestant with the lowest individual score is in the winning unit, the trainee with the next-lowest score will be eliminated. They are given seven days to prepare. Son Sung-deuk and DOOBU evaluate the I-Landers as a midpoint check.

Choreographers Bae Yoon Jung and Son Sung-deuk give a mini-mission, a freestyle dance battle, with those ranking first through third serving as leaders of each unit and choosing either their unit lineup or song.

The "Fake Love" unit ranks first. Ta-ki receives the lowest individual score but is saved from being eliminated as he is a member of the winning unit. Lee Geon-u, who places 11th, is eliminated instead.^[17] The contestants placing first through third based on individual scores earn the opportunity to spend one day of outside of the I-Land.

•   Unit with the highest score and is exempted from elimination
•   Unit with the lowest score
•   Contestant that was eliminated
•   Contestant that was originally eliminated but was saved by the winning unit's exemption card

Chemistry Test

The second test of the second part of the show is about the chemistry between the contestants and global fans. The contestants are divided into two units and must perform two new singles: "Flicker" and "Dive Into You", the former later being released as a part of ENHYPEN's first EP "BORDER: DAY ONE". The eliminations for this round will be determined by global votes. The contestant who is chosen by the producers as first place will have their votes in the 24 hours before global voting ends doubled.

Lee Hee-seung, the first-place contestant, selects his song and unit lineup. Each unit has six days to prepare. Son Sung-deuk and DOOBU evaluate the units' performances, while vocal coach Kim Sung-eun evaluates the vocal performances of the I-Landers as a midpoint check. Jake was the I-Lander picked by the producers. The contestant who places 11th participates in the mini-mission and practices for the next test, the Concept Test, but does not perform for the producers.

•   First place contestant picked by the producers
•   Contestant that was eliminated

Concept Test

The third test of the second part of the show is about concept performance and features a mini-mission to form teams. The trainees cover two songs by Seventeen, "Pretty U" and "Hit". They are given one day to practice. The8, Jun, Dino and Hoshi of Seventeen visit the I-Land to administer the mini-mission themselves, which was won by Team "Pretty U". Kim Sunoo places first and selects his song and lineup for the main mission. The contestants are divided into two units to perform new singles: "Chamber 5 (Dream of Dreams)" as a refreshing concept and "Flame On" as an explosion concept. The producers then choose the contestant who will be eliminated based on individual scoring.

Park Sung-hoon and Kim Sunoo were appointed as team leaders. Ta-ki, who placed 11th in global votes for the previous Chemistry Test, is eliminated. Kim Sun-oo replaces Ta-ki with Park Sung-hoon, and K replaces Park Sung-hoon as leader of "Flame On". Both units have five days to practice, and Son Sung-deuk evaluates them as a midpoint check.

K places first in the main part of the Concept Test, and Hanbin is eliminated by virtue of placing tenth.

•   First place team (chosen by Seventeen)
•   First place contestant

•   First place contestant
•   Contestant that was eliminated

Final Test

The last test of the show will determine the lineup of the debut group, which will have seven members. The top six trainees will be selected from global votes, while one trainee will be chosen by the producers. The trainees perform a new single titled "Calling (Run Into You)" during the live broadcast. Son Sung-deuk and DOOBU evaluate the I-Landers as a midpoint check. The I-Landers will also get to film their own PR video, the duration of which is based on their ranking; trainees placed first, second, and third will have 60, 50, and 40 seconds, respectively, and the remaining will have 30 seconds.

The 13 previously-eliminated trainees return to the I-Land and reunite with the current contestants to practice their first song, "Into The I-LAND", together and perform it on live broadcast for the first time.

The debut group name is revealed as "Enhypen", derived from the hyphen (-) symbol, which implies connection, discovery, and growth. The final lineup consists of Yang Jung-won, Jay, Jake, Niki, Lee Hee-seung, Park Sung-hoon, with Kim Sun-oo as the producer's pick.

•   Debuting contestants voted by global fans
•   Contestant that was picked by the producers to be in the debut lineup
•   Contestants that were eliminated

Global voting

A global voting system opened after Episode 5 on July 24, 2020 at 12:00 a.m. KST and ended on August 2, 2020 at 12:00 a.m. KST. Viewers vote once per day for six contestants out of the total 23 that they wish to see progress to the second part of I-Land.

The second global vote started on August 1, 2020 at 12:00 a.m. KST, after Episode 6, and ended on August 2, 2020 at 12:00 p.m. KST. Viewers vote for six contestants out of the 16 Grounders, excluding the top six I-Landers, that they wish to see progress to the second part of I-Land. Every vote is multiplied by three.

Global voting

Another global voting system was introduced to select the seven debuting members. For the first part of voting, each viewer can vote up to two contestants per day from August 15, 2020 12:00 a.m. KST to August 29, 2020 11:59 p.m. KST. Votes for contestants who were eliminated during the voting period are disregarded.

The second part of voting started on September 5, 2020 and ended before the final episode on September 18, 2020. Viewers can select only one contestant per day. Votes for contestants who were eliminated during the voting period are disregarded.

Another voting period occurred during the live broadcast of the show's finale. Viewers can select only one contestant, and voting is only open for an hour.