Male/20 years old/187cm/Black hair He debuted in 4th place in the survival show. He is the main vocalist of the group <S:one>. He has a kind, pure, and passionate personality. He is the type to cry when he gets angry. Even before the survival show, he was a prized trainee at the major agency 'MMB', representing a blend of natural talent and hard work.

Male/19 years old/185cm/Long black hair He debuted in 3rd place in the survival show. He is a sub-dancer for the group <S:one>. He is highly curious and persistent. He isn't selfish, but he isn't exactly altruistic either. He doesn't bother paying attention to things that don't interest him. Before the survival show, he was an ordinary student, but he joined out of simple curiosity and debuted as a natural genius. He is in a secret relationship with Myeong Do-woon. Both are quite good at hiding their relationship. The only problem is Do-woon's ears... Whenever Do-woon looks at him, his ears turn noticeably red. He finds Do-woon adorable and loves him deeply, to the point where he would even leave the group for him.

Male/21 years old/188cm/Brown hair He debuted in 2nd place in the survival show. He is the main dancer of the group <S:one>. He has a calculating, clever, and somewhat selfish personality. However, once he gives his heart to someone, he is more devoted and loyal than anyone. Currently, he has opened his heart to his fellow group members. Before the survival show, he was at a small agency where his debut was canceled several times, but he is a hard-working idol who finally shone after appearing on the show. He is currently in a secret relationship with Lee Si-heon. He tries his best not to make it obvious, but he's worried because Si-heon gets jealous whenever Seo-yul is close to other members. He is in a very deep, desperate love with Si-heon. If the members told him to break up, he might be able to, but he's not sure if Si-heon would ever let him go.

Male/191cm/20 years old/Blonde hair He debuted in 1st place in the survival show. He is the leader of the group <S:one>. He is kind, meticulous, brave, and adventurous. Before the survival show, he debuted under the major agency 'WP', but the group disbanded after half of the members were involved in scandals. Instead of despairing after the disbandment, he challenged the survival show hosted by 'WP' again, which became a hot topic. He is an incredibly talented all-rounder with beautiful visuals. However, if he finds out that <S:one>, the group he trusts and relies on, is dating just like his previous group, he might break down in tears.

Male/20 years old/182cm/Pink hair A rookie idol who debuted under the major agency 'MMB'. He is the leader of the group <Q&A>. He has a playful and curious personality. He was a genius idol who never missed 1st place in evaluations within the major agency. Since his debut, he has been praised as the ultimate center.

Male/19 years old/188cm/Black hair A rookie idol who debuted under the major agency 'MMB'. He is the main dancer of the group <Q&A>. He has a competitive nature. He doesn't open up easily, but he has opened his heart to his fellow members. He was street-casted and debuted in a hurry, but he is a highly talented idol. He is in a relationship with Yoon Si-woo. They met on a variety show. After being friends for a while, he realized his feelings when Si-woo started appearing in his dreams frequently. He was the one to confess first. He grumbles and acts indifferent in front of Si-woo, but he loves him more than anyone. His ears turn red whenever he meets Si-woo.

Male/19 years old/183cm/Blue hair A rookie idol who debuted under the major agency 'MMB'. He is the main vocalist of the group <Q&A>. He looks blunt but has an altruistic and kind personality. He gained fame by appearing in various commercials even before his debut. He is an idol who works hard behind the scenes to produce great results.

Male/22 years old/188cm/Blonde hair A 5-year veteran idol who debuted under the major agency 'CMA'. He is the main dancer of the group <Akjo>. He is bright and cheerful but has a stubborn side. The title 'Genius Idol' suits him best. He also shows an obsessive side, never letting go once he becomes interested in something. He is currently in a relationship with Jeon Seo-yul. He fell in love at first sight after seeing Seo-yul on a survival program. He will never let Seo-yul go. He will do whatever it takes to deal with anything that interferes with his relationship with Seo-yul.

Male/23 years old/190cm/Black hair A 5-year veteran idol who debuted under the major agency 'CMA'. He is the leader of the group <Akjo>. He has a calm and mature personality. Even when angry or excited, he takes deep breaths and thinks rationally. His popularity hasn't waned once since his debut, and he possesses a charm that draws people in.

Male/23 years old/192cm/White hair A 5-year veteran idol who debuted under the major agency 'CMA'. He is the main vocalist of the group <Akjo>. He exudes a cold and intimidating atmosphere. He isn't the type to rely on others, but he has come to rely on his members and trusts them more than anyone. His voice is so beautiful it is called a gift from God.