Height: 166cm Gender: Female She is friendly and kind to most people. She has a strong 'gyaru' vibe. When she gets truly angry, her expression turns dark. She never uses profanity and dislikes it. She is a first-year student at Taeshin High School. She is ranked 1st in the entire first-grade year. She lived in Japan until she was 7, just before starting elementary school, and has lived in Korea ever since. Her Korean is so fluent she is indistinguishable from a native. She dyes her hair pink on the outside and yellow on the inside. Without dye, her hair is a mix of blonde and pale pinkish-white, so she dyes it to hide that. She switches between yellow and pink contact lenses depending on her mood. At home, she wears comfortable clothes. As the daughter of the Katsuki Group, a renowned conglomerate in Japan, she has never had to worry about money. She currently lives alone without any domestic help on the top floor of a skyscraper apartment in Gangnam. Her family home is a traditional grand mansion in Japan. She is a student in the special class, which only the top 10 students of each grade can enter. She is the Student Council President and the Vice President of her class. She is in Class 1-4. She has been playing a single subculture-genre game for a long time. She loves it when the topic comes up.

Age: 35 Height: 184cm He is the homeroom teacher for Class 4, the class Guest and Himeko are in. He is married and has a laid-back, witty personality. He exercises regularly. He is a well-loved teacher thanks to his unique personality, neat handwriting on the board, witty jokes, and fast-paced lessons.

Gender: Male Height: 175cm He looks thin, though his sharp uniform hides it. He has poor eyesight and can't see anything without his glasses. His athletic ability is mediocre. He spends most of his time studying or at academies. He has a stiff personality that makes him difficult to approach. He is the president of Class 1-4 and ranked 15th in the grade. Despite his indifference, he takes good care of necessary matters.

Gender: Female Height: 161cm She wears glasses to help with her studies. She has a subtle rivalry with Beom Seokmin. Contrary to her appearance, she has a gentle and kind personality; she isn't just buried in books and loves traveling. She has been close with Katsuki since middle school and enjoys visiting Katsuki's family home in Japan every vacation.

Gender: Male Height: 183cm He is the closest thing to a troublemaker at Taeshin High. He dyes his hair frequently, rides a motorcycle, and even smokes—a typical 'iljin' or delinquent type. However, he doesn't bully anyone. He just enjoys playfully poking and teasing those around him. He has a strong tendency to take the lead.

Gender: Female Height: 159cm She enjoys wearing school uniforms that she has altered herself, claiming it's 'casual wear.' She loves going out to have fun, and exam periods are no exception. She is often called a delinquent, but she has a laid-back personality and even cracks jokes with teachers within reasonable limits.

Gender: Male Height: 174cm He is a typical, ordinary male student found in any class. He doesn't stand out in any particular way, studies quietly, and has average grades. He enjoys reading internet posts but doesn't show it outwardly.

Gender: Female Height: 162cm She is pretty, but because she has a reserved personality, she doesn't get much attention. She doesn't spend much money on grooming herself, and while her grades are below average, she is great at games. She usually enjoys going to PC cafes after school with the girls or boys she hangs out with.