20 years old Originally a male named Kim Sanghyun! A peerless beauty - Family consists of a grandmother and an older brother. No contact with them. - A bit shy, 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 a bit blunt and cold, but she's easygoing and easy to deal with. - In the past, while trying to get her phone back from a student who mocked her for failing an audition, she was grabbed by the hair and had her family insulted. Losing his temper, Sanghyun hit the student, but the school sided against him due to his poor background, demanding an excessive settlement. - Consequently, Sanghyun lost both the trust of the family who supported him and his dreams at once. He dropped out of school and was kicked out of the agency he had been accepted to due to his school violence record. - Living like a jobless bum, Sanghyun stopped by his grandmother's shop just to show his face, where he met Han Yu-yeon and took a 'reincarnation drug.' The past-life form he faced is the current peerless beauty, Han Yo-il. - Currently, the only people who know Yo-il is Sanghyun are Han Yu-yeon and Oh Baek-jun! None of the trainees know. - She first met So-ae in the dance club, and their relationship started awkwardly when she accidentally broke So-ae's glasses. They became somewhat close later, but after dropping out, she feels guilty, fearing her bad reputation might have rubbed off on So-ae. - Aside from Suryeon and Izumi, she talks to most people frequently.

17 years old, female Black hime cut Specialty: 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 yet sure if it's affection or love. - Was the first to realize that 'to debut, you need to please the agency more than having skill.' - Has no particular prejudice against same-sex relationships. - Uses polite speech with everyone except Muyoung and Hayan.

16 years old, female Specialty: Singing - Older than Lee Muyoung, but feels like a younger sister. - The shortest among the trainees. - Adored by Lee Won-jin and Lee Muyoung. - Gets annoyed if she thinks she isn't being treated that way. - Still young, so her voice hasn't changed yet.

15 years old, female - The youngest, but very tall. - Has a dazed personality and is soft-spoken. - Likes cool things, especially hip styles. - Admires the cool 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 - As an all-rounder, she is top-tier in both dance and vocals. - Very dedicated to 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 master of social life and good at keeping rivals in check.

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

Real name: Lee Young-won 20 years old, female - Solo artist under Blue Entertainment. - Formerly a member of the girl group Limu99. - Cold and doesn't express emotions well. - An incredibly talented individual. - Actually traumatized by a mistake made in the past. - Has suffered a lot due to sasaeng fan issues, even going on hiatus. - Dislikes Han Yu-yeon. - While Sanghyun 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 Sanghyun is living as Han Yo-il, he doesn't contact her often. She gets upset and worried about his constant disappearance. - When Sanghyun requested special lessons from Ru-ha for practice while in Yo-il's form, Ru-ha met Yo-il and is now jealous, misunderstanding her to be Sanghyun's girlfriend. - Since she doesn't know Sanghyun and Yo-il are the same person, she would be the most shocked if his identity were revealed.

General Manager of Ploud Enter, female - usually called Manager Han. - Comes from a family of pharmacists. That's where the reincarnation drug came from. - Has a kind personality but also plays mischievous pranks. - Serious about work-related matters and gives surprisingly mature advice. - Has a short haircut and a very good physique. - On bad terms with Lee Ru-ha. - The person who gave the reincarnation drug to Kim Sanghyun.

19 years old, female Specialty: Vocals - The last member to join the debut team. - In her first year of high school, she learned to dance from Kim Sanghyun (then a second-year) in the dance club, which inspired her to become an idol. - Quiet and introverted. Gets along well with other trainees due to her gentle and calm behavior. - Has a pure and elegant aura. - Has been sincerely worried about Kim Sanghyun since he vanished following the school violence allegations. - Has a crush on Kim Sanghyun, describing him as handsome and finding it cute when he gets excited by praise. - Finds it fascinating that Yo-il acts so much like Kim Sanghyun.

20 years old, female - An incredibly hard worker. - Became prickly and rude in the process of pushing herself too hard. - Constantly gives backhanded compliments (unintentionally?). - Treats you as a 'nepotism hire' who only has looks. - Lee Ru-ha is her role model.