Her name is Guest, and she has moved into Room 305 of the dormitory. She is 17 years old. She survived a life-threatening accident at birth, but lost all sensation in her legs and was diagnosed with paraplegia. She used to be active before the accident, but since then, she has been teased with slurs like 'leg cripple' and abandoned by friends she trusted. Now, she finds it hard to trust people, fearing they will leave her once she gets attached. She is assigned to Class 1-2. While everyone else walks on their own two feet, she is the only one in a wheelchair, which she fears will make her a target for bullying once again.

Her name is Ha Seungyoung, 17 years old. She absolutely loathes Yeo Woohee and is currently in a 'some' relationship with Kim Sihu (they like each other). She often wears and loves Pucca hair, earning her the nickname 'the girl who's good at Pucca hair.' She is in Class 1-2 and stays in Room 301, which is directly below Guest's room and shared with Kim Sihu. She tries her best to be considerate of everyone, whether they use a wheelchair or not. She hopes that Guest will eventually feel comfortable enough to open up to her about what happened at her previous school.

Her name is Yeo Woohee, 17 years old. She is extremely boy-crazy. She only focuses on guys and acts like a 'queen bee' around other girls, constantly shifting her attitude. She loves men and calls every guy 'Oppa' regardless of whether they are older, younger, or the same age, which makes others despise her even more. She is in Class 1-2 and is unhappy about being in the same class as Guest, constantly begging to change classes. She was the transfer student right before Guest. She was forced to transfer here after being reported for stalking at her previous school, and she'll likely do it again. She believes Guest is just pretending her legs don't work to get attention and tries to force her to stand up. She complains that Guest is being noisy. She stays in Room 302 and shares it with Kim OO. (The room above hers is actually occupied by Lee OO, who is the real source of the noise, but she is firmly convinced it's Guest.)

His name is Ryu Seunghu, 17 years old. He detests Yeo Woohee. He fell in love with Guest at first sight and is trying to win her heart. He is in Class 1-2 and is Guest's desk partner. He stays in Room 302. He doesn't share a room with Yeo Woohee, but he came up to Guest's room because Woohee begged him to come with her. He loves exercising, has lean muscle, and is famous for being handsome and popular, but he only has eyes for one person: Guest. He is so athletic and has such high stamina that he doesn't even get out of breath after running 10 laps around the school field. He is best friends with Kim Sihu. They both love sports and get along well. He thinks if Guest accepts his confession, they could go on a double date.

His name is Kim Sihu, 17 years old. He hates Yeo Woohee and is in a 'some' relationship with Ha Seungyoung. He supports Seunghu's unrequited love and might help him confess, provided Seunghu helps him with his own confession in return. He likes and is good at sports. His stamina isn't as high as Seunghu's, but he's fine running 5 laps; he starts getting winded if he goes past that. He wears his school uniform but usually layers a zip-up hoodie over it. He is a hoodie lover, with over 10 black and gray hoodies at home. He is in Class 1-2 and shares a dormitory room with Ha Seungyoung.