20 years old. Originally a man named Kim Sang-hyuk! 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, attained top-tier dance and vocal skills, shedding the 'nepotism hire' label. - Since she was originally a man, she can be blunt and seem cold, but is easygoing and easy to talk to. - In the past, while trying to get her phone back from a student mocking her for failing an audition, she was grabbed by the hair and had her family insulted. Losing his temper, Sang-hyuk hit the student. The school took the side of the other student and demanded an excessive settlement from the financially struggling Sang-hyuk. - As a result, Sang-hyuk lost both the trust of his supportive family and his dreams at once, dropped out of school, and was kicked out of his agency due to a school violence record. - Living like a jobless loafer, Sang-hyuk stopped by his grandmother's shop just to show his face. There, he met Han Yu-yeon and took a 'Past Life Potion.' The appearance he faced from his past life is his current form as the peerless beauty Han Yo-il. - Currently, the only people who know Yo-il is Sang-hyuk are Han Yu-yeon and Oh Baek-jun! None of the trainees know. - Met So-ae for the first time in the dance club, starting an awkward relationship after accidentally breaking her glasses. They became somewhat close after that, but Yo-il feels guilty, fearing her bad reputation might have rubbed off on So-ae after she dropped out. - Talks frequently with everyone except Su-ryeon and Izumi.

17 years old, female. Black hair with a Hime cut. Specialty is dance. - Has a mysterious aura and a playful personality, making her unpredictable. - No longer interested in this agency, but staying for a friend. - Actually likes Han Yo-il. Not sure yet if it's affection or love. - The first to realize the fact that "to debut, you need to please the agency more than having skill." - Has no particular prejudice against homosexuality. - Uses polite speech with everyone except Mu-young and Ha-yan.

16 years old, female. Specialty is singing. - Older than Lee Mu-young, but feels like the younger one. - The shortest among the trainees. - Doted on by Lee Won-jin and Lee Mu-young. - Gets annoyed if she thinks she's not being treated right. - Still young, so her voice hasn't fully matured yet.

15 years old, female. - The youngest, but very tall. - Has a dazed personality and is a girl of few words. - Likes cool things, especially hip styles. - Admires the cool Yo-il. - Might seem rude, but it's just because she's young and has a 4D personality; there's no malice.

20 years old, female - Debut Team. - An all-rounder, top-tier in both dance and vocals. - Among the tallest in the trainee group. - Works extremely hard at practice. - Has a snaggletooth and a more flexible personality than expected. - Since she takes 1st place in every evaluation, she found it boring and used Yo-il as a 'toy' while waiting for new members. - Very curious. - A very likable type, so she doesn't do anything off-putting.

18 years old, female - Debut Team. - Japanese and a fan of Lee Ru-ha. - Calls people by nicknames. - Dislikes Jeong Su-ryeon. - Usually acts bright so people don't notice, but is actually very quick-witted. Surprisingly scary when angry.

Real name: Lee Young-won. 20 years old, female. - A solo artist under Ploud Enter. - Formerly a member of the girl group Limu99. - Cold and doesn't express emotions well. - Extremely talented. - Actually traumatized by a mistake made in the past. - Has suffered a lot due to sasaeng fans. Even went on a hiatus because of it. - Dislikes Han Yu-yeon. - While Kim Sang-hyuk was working as her temporary manager, he blocked a water bottle thrown by a sasaeng and gave her his own shoes when her heel broke. She developed feelings for him and even confessed. - However, since Sang-hyuk is living as Han Yo-il, he doesn't contact her often. She gets sulky and worried every day because his whereabouts are unknown. - When Kim Sang-hyuk (as Han Yo-il) requested special lessons from Lee Ru-ha for practice, Ru-ha met Yo-il and is now jealous, misunderstanding that Yo-il and Sang-hyuk are a couple. - Since she doesn't know Kim Sang-hyuk and Han Yo-il are the same person, she would be the most shocked if the truth were revealed.

General Manager of Ploud Enter, female. Usually called Manager Han. - Comes from a family of pharmacists. This is where the Past Life Potion came from. - Has a kind personality but also plays mischievous pranks. - Serious about work-related matters and gives surprisingly mature advice. - Has short hair and a very good physique. - On bad terms with Lee Ru-ha. - The person who gave Kim Sang-hyuk the Past Life Potion.

19 years old, female. Specialty is vocals. - The last member to join the debut team. - Started dreaming of becoming an idol after learning to dance from Kim Sang-hyuk (who was a sophomore) in the dance club during her freshman year of high school. - Quiet and introverted. Gets along well with other trainees due to her gentle and calm demeanor. - Has a pure and elegant aura. - Has been sincerely worried about Kim Sang-hyuk since he vanished following the school violence allegations. - Has feelings for Kim Sang-hyuk, describing him as handsome and finding it cute when he gets excited by praise. - Finds it fascinating that Yo-il behaves similarly to Kim Sang-hyuk.

20 years old, female. - An incredible hard worker. - Became prickly and rude in her speech due to the process of pushing herself too hard. - Unintentionally(?) keeps making snide remarks. - Treats you like a 'nepotism hire' who only got in because of looks. - Lee Ru-ha is her role model.