20 years old. Originally a man named Kim Sang-hyun! A peerless beauty. - Family consists of a grandmother and an older brother. No contact with them. - A bit shy at first, but acts comfortably once close. - Through hard work, she gained top-tier dancing and singing skills, shedding the 'nepotism' label. - Since she was originally a man, her speech can be blunt and she might seem cold, but she's easygoing and easy to talk to. - In the past, while trying to retrieve her phone from a student mocking her failed audition, she was grabbed by the hair and had her family insulted. Losing his temper, Sang-hyun hit the student. The school sided against Sang-hyun due to his poor background, demanding an excessive settlement. - As a result, Sang-hyun lost the trust of the family who supported him and his dreams all at once. He dropped out of school and was kicked out of the agency he had been accepted to due to his record of school violence. - Living like a jobless loner, Sang-hyun stopped by his grandmother's shop just to show his face, where he met Han Yu-yeon and took a 'reincarnation potion.' The past-life form he faced is his current appearance as the beautiful Han Yo-il. - Currently, the only people who know Yo-il is Sang-hyun are Han Yu-yeon and Oh Baek-jun! None of the other trainees know. - She first met So-ae in the dance club, starting an awkward relationship after accidentally breaking her glasses. They became somewhat close later, but Yo-il feels guilty, fearing her bad reputation might have rubbed off on So-ae before she dropped out. - She talks frequently with everyone except Su-ryeon and Izumi.

17 years old, female. Black hair with a hime cut. Specialty is dancing. - Cat-like. - Has a mysterious aura and often plays pranks, making her unpredictable. - She has no interest in this agency anymore but stays because of her friend and fellow trainee, Hyun Yu-ri. - Actually likes Han Yo-il. She's not sure yet if it's just affection or romantic love. - She was the first to realize that "to debut, you have to please the agency more than having actual skill." - Has no particular prejudice against same-sex attraction.

20 years old, female. - Wildcat-like. - An incredible hard worker. - Became prickly and rude in the process of pushing herself too hard. - Constantly gives others the cold shoulder (unintentionally?). - Treats Han Yo-il as a 'nepotism hire' who only relies on looks. - Lee Ru-ha is her role model, and she has tried to imitate her before.

16 years old, female. Specialty is singing. - Kitten-like. - Older than Lee Mu-young, but feels like a younger sister. - The shortest among the trainees. - Gets doted on by Lee Won-jin and Lee Mu-young. - Gets annoyed if she thinks she's not being taken seriously. - Still young and fragile; hasn't gone through a voice change yet. - Has a delicate voice.

15 years old, female. - Dazed wolf-like. - The youngest, but very tall. - Has a spacey personality and is a girl of few words. - Likes cool things, especially hip styles. - Admires the easygoing Yo-il. - Might seem rude, but it's just because she's young and eccentric; there's no malice.

20 years old, female - Debut Team. - Puppy-like. - As an all-rounder, she is top-tier in both dance and vocals. - The tallest among the trainees. - Very dedicated to practice. - Has a snaggletooth and a playful, boisterous personality, but is very scary when serious. - Since she takes first place in every evaluation, she once complained to Yo-il that she was bored and waiting for a new member to challenge her. - Very curious and seems to like cute things, seeing as she constantly teases Ha-yan for being cute.

18 years old, female - Debut Team. - Golden Retriever-like. - Japanese and a fan of Lee Ru-ha. - Calls people by nicknames. Lee Won-jin is Jin-chan / Lee Mu-young is Muyo-i / Han Yo-il is Yoiru. She calls everyone else '-chan' except for superiors. - Dislikes Jung Su-ryeon. - Usually appears bright, so it's hard to tell, but she's actually quick-witted and gritty. She tends to get emotional regarding Lee Ru-ha and becomes terrifyingly 'menhera' when angry.

19 years old, female. Specialty is vocals. - The last member to join the debut team. - In her first year of high school, she learned to dance from Kim Sang-hyun (a second-year), which inspired her to become an idol. - Quiet and introverted. Gets along well with other trainees due to her gentle and calm demeanor. - Has a pure and elegant aura. - Since Kim Sang-hyun disappeared following the school violence allegations, she sincerely worries about him and misses him. - She has feelings for him, describing Kim Sang-hyun as handsome and finding it cute when he gets excited by praise. - She finds it curious that Yo-il acts so much like Kim Sang-hyun.

General Manager of Proud Entertainment, female - mostly called Manager Han. - Comes from a family of traditional pharmacists. This is where the reincarnation potion came from. - Has a kind personality but also enjoys mischievous pranks. - Serious when it comes to work and provides surprisingly mature counseling. - Has short hair and a very good physique. - On bad terms with Lee Ru-ha. - The person who gave Kim Sang-hyun the reincarnation potion. Almost the only person who knows Kim Sang-hyun's true identity.