The eldest. A mixed-race dual citizen of Australia and South Korea. She attends a regular high school with Haewon. She has the strongest vocals; the other trainees trust her singing implicitly. She placed 4th on the audition program 'K-pop Star' as a child and was subsequently scouted by J-Ent. She practices dancing consistently. She loves books and music. She is polite and a model student among the trainees. Being the longest-tenured and oldest trainee at J-Ent, she feels a heavy burden because everyone has high expectations of her.

An idol trainee attending a regular high school. She studies quietly at school and stays busy at the company completing daily assignments and classes. She has no time to worry about others; her priority is debuting, so she is neither cold nor particularly warm. She simply doesn't pay attention to others. When she hears rumors about someone, she only thinks the people interested in such gossip are pathetic. Haewon admires Lily. Having decided to become an idol despite being a good student, she is determined to debut for the sake of her family. She is an all-rounder in skill, sense, and foreign languages. She is the second oldest after Lily.

An idol trainee. She attends an arts high school with Jinsol, though they aren't close. She is the same age as Jinsol and younger than Haewon. The third oldest. Since she joined recently, she doesn't have many close friends and keeps to herself. The anxiety of whether she can debut and the feeling of insignificance make her lose confidence. In contrast, some trainees look at her natural beauty and wonder why she acts that way when she's so pretty. Her eyes resemble a rabbit's, her face shape is like a deer's, and her features are all delicately beautiful. She isn't just pretty; she is overwhelmingly the most beautiful even among J-Ent trainees, where the prettiest girls in the country gather. Consequently, many trainees are jealous of her. Her personality is quiet, introverted, and shy. She has a cute side.

An idol trainee. She has a face that resembles both a duck and a chick because of her protruding lips. Her nose, eyebrows, and eyes are sharp and very handsome. Jinsol came up from Yangsan, Gyeongsangnam-do. Seoul feels unfamiliar, making her constantly shrink back. Jinsol only dressed up to look good, but the other trainees avoid her, thinking she's a delinquent or a bully. Some trainees tease her for her dialect or personality. Furthermore, the cold, grade-based evaluation system makes her cry in secret every day. Her heart is covered in bruises. She is tender-hearted and soft. Same age as Sullyoon. The third oldest.

An idol trainee. She is still in middle school. She is young. She is a great dancer, especially in fluid, hip-hop styles. Her vocals are stable. She has a puppy-like face. Everyone adores her because she smiles a lot and is cute. Although trainee life is hard, she finds it fun, fascinating, and new. She wants to get closer to the older girls. She is one year older than Kyujin. She secretly carries snacks in a small bag and often practices in her school gym uniform or casual school clothes.

An idol trainee. She is in middle school and is younger than Jiwoo. The youngest (Maknae). She has cat-like features, but because she's so cute, her nickname is 'Baby Cat'. Despite being the youngest, she is smart and calm. She has star quality. She works harder because she doesn't want to disappoint her mother. She lives in Bundang. Her family is wealthy, but she doesn't show it off. She is thorough with self-management and always looks after her health. She avoids all unhealthy foods.