Fantasy Boys is a South Korean reality competition show created by MBC. The purpose of the show is to form a 12-member boy group with the potential to chart on Billboard.^[1] 55 contestants were chosen out of 1,000 applicants from around the world, primarily from South Korea, China, Taiwan, Japan, Thailand, and the United States,^[2] and divided into three groups known as "grades". After the final episode, the top twelve contestants were selected to debut as members of the boy group Fantasy Boys.

The English names of the contestants are presented in Eastern order in accordance with the official website.^[3]

The ages of all contestants are presented according to the Korean age system as of the start of the competition.

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After the producers in the Producer Zone watch the Admission Evaluation performances, they will evaluate them by either choosing them by selecting 'O' or rejecting them with an 'X'. If a contestant gets chosen by all producers, they get placed in Grade 1; if they are chosen by two to three producers, they receive Grade 2; and if they are chosen by only one or none of the producers, they are assigned to Grade 3. Grade 3 contestants' admission will be put on hold for the time being and they become candidates for elimination, while Grade 1 and Grade 2 passed the admission evaluation and can enter the dorm.

Bold numbers are contestants whose performances were partially or entirely unaired during the episode broadcast. Full versions of the performances will be released on Naver NOW after the Admission Evaluation ends.

For the first semester, Jeon So-yeon served as the main producer. All the producers re-evaluated the grade for Grade 1 and Grade 2 contestants, with Grade 1 limited to 14 contestants. The pending admission for Grade 3 was selected based on the global vote. An early pass from the main producer was given during the interim check.

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Contestants are to rank each other by placing stickers on each other. The contestants with the most stickers have the advantage of choosing their choice of the team they want to join for the second semester's mission.

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For the second semester, Jang Woo-young served as the main producer.

A pre-mission 'Fashion Runway' will decide which member of each team will have the first heart fluttering part. Each team will stand on the runway and be given time to show off their charms. The boy who gets his photo taken the most by the Fantasy Makers will be assigned the first heart fluttering part for their team.

The second heart fluttering part will be assigned by the producers during the interim check.

The first place of each team will receive a benefit of 2,000 points.

For the third semester, Jin-young served as the main producer.

Each song has a set number of contestants for each position: Dance, Vocal and Rap. Vocal positions take the vocal and ad lib sections. Dance positions take the dance break section. Rap positions must show their capabilities through rap making.

The first three contestants who are able to pick their choice of song were based on a pre-match unknowingly carried out in the morning before the mission announcement. The highest karaoke scores determined first place for vocal and rap positions, and dance position's first place was chosen by Random Play Dance. The first three contestants is as follows: Moon Hyun Bin (dance), Hikaru (vocal), and Seo Sang Woo (rap).

The remaining order of contestants to pick their chosen song & position were based on a lucky draw. Contestants can also challenge an already occupied position through a 1:1 battle, where the other members of the same song can choose whom to take into their team.

The contestants who take first place in either vocal, rap, or dance positions over the other contestants in the same position will receive a benefit of 10,000 points each. The members of the same team as the first place contestants will also receive a benefit of 5,000 points each.

Total individual points are added in the following way: Onsite audience votes are multiplied by 500, plus online global voting score, plus any benefits gained from winning first place (position benefit and team benefit).

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For the fourth semester, Kang Seung-yoon served as the main producer.

Each team will have seven members and contestants are free to choose the team members they want. Each team is also responsible of creating their own choreography. Songs are chosen in a first come first served basis, in the order that the team creation is completed.

During the interim evaluation, one member will be released from each of the four teams of seven, excluding the team that won first place. The three released members is then to join the My First and Last team, which was the last team formed with the remaining four contestants.

Team scores are given by adding the scores of the live audience, producers and trainers. Benefits are given based on the team rankings: 1st place will receive benefits for all members, 2nd place will receive benefits for three members, 3rd place team for two members, 4th place for one member, and last place receives no benefits. The leader of each team will decide who receives the benefit. The benefit scores will be four times more than the number of live votes.

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The two teams @IN_US and Runners performed their songs "SPACEMAN" and "RUN" respectively at MBC's Show! Music Core on May 20, and SBS M's The Show on May 23 prior to the release of the episode 9.

The four main producers creates four teams and chooses the seven members for their team in the order: So-yeon, Seung-yoon, Woo-young and Jin-young.

A total of three benefits can be received, two individual benefits and one team benefit.

The first individual benefit is the member with the most votes from the onsite audience. The second individual benefit is the producer's pick benefit. Regardless of the audience vote, the producer in charge of each team will choose one contestant who they think did well in the performance.

In addition to the two types of individual benefits, the team with the highest total number of onsite audience votes will have all of its members receive benefits.

The two teams Sugar Pop and Flash performed their songs "Snacks" and "Hold me tight" at MBC's Show! Music Core on May 27, and SBS M's The Show on May 30.

Episode 10 was aired live on June 1, 2023 where semi-final eliminations and live text voting took place. A total of 20 contestants made it into the finals.

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The two teams Black Perfume and SWITCH performed their songs "Gesture" and "Shut Off" respectively at MBC's Show! Music Core on June 3, prior to the release of the episode 11.

The two teams are divided with the top 2 ranked contestants (the two boys who got the most global votes from Semester 1 to Semi-final round minus the benefits) as the team representatives, Hong Seong-min and Yu Jun-won. The two representatives picks their own team members, with Jun-won picking his team members first. A physical competition also took place where the first team to win two games will get to choose the song they want for the final mission.

After each performance, voting by the on-site audience and producers is conducted, where they are also to cast votes for multiple contestants if they wish to do so. The total individual on-site votes are calculated with each audience vote and each producer vote are multiplied by 10. The team with the higher average of on-site votes will receive a benefit of 2,000 points for each team member.

The total points for the finale round and to determine the final debut members is as follows: final mission score, finale benefit if gained, online global votes, offline special votes multiplied by 100, and live text votes multiplied by 30.

Episode 11 was broadcast live on June 8, 2023 where the finale and live text voting took place to determine the final 12 contestants.

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