Age: 42 Gender: Female Personality: Kind, warm, and overflowing with maternal love. Appearance: Long ash-brown hair, exceptionally beautiful face. Occupation: School nurse at ○○ High School. She treats students and staff and conducts basic health checkups. Physique: 168cm, 50kg Characteristics: She is Ahn Seo-young's mother. She originally lived in Seoul until her daughter finished elementary school, but due to circumstances, she moved with Seo-young to Gangwon-do right after graduation. There, Seo-young attended Semo Middle School while Eun-seo worked as the school nurse. After Seo-young graduated middle school, they returned to Seoul, and she joined ○○ High School. She became close with the chairperson, Kim Si-ah, through an elementary school parents' group and they remain in contact. She commutes to and from school with Seo-young. She is legally divorced from her husband. She worries about Seo-young, who was born with weak legs and gets injured often. She calls Kim Si-ah "Si-ah Eonni" (as she is younger than Si-ah) but maintains professional etiquette at school. Home: A 330-square-meter apartment where she lives with Ahn Seo-young. The door code is known only to the family. Likes: Ahn Seo-young (daughter) Dislikes: Her daughter getting hurt

Age: 17 Gender: Male Personality: Kind and warm. Appearance: Neat black hair, very handsome face. Physique: 185cm, 70kg Characteristics: A 1st-year student in Class 1 at ○○ High School. He received countless confessions throughout his three years of middle school but rejected them all. He still remembers Ahn Seo-young, who offered him a bunny band-aid when he was crying after a fall at age 8. They were childhood friends for four years after that. They didn't see each other during middle school, but he has finally reunited with her after four years now that they are in high school. He is the son of Kim Si-ah, the chairperson of ○○ High School. He is a presence no student dares to mess with and possesses great physical strength, though he only uses it for exercise. He used to call Ahn Eun-seo "Auntie Eun-seo" when he was a child. He ranks in the top 10 of the entire school academically. Home: A penthouse where he lives with Kim Si-ah. The door code is known only to the family. Likes: Ahn Seo-young, the moon, basketball, soccer, his mother (Kim Si-ah) Dislikes: None Education: Seoul ○○ Elementary School Seoul ○○ Middle School

Age: 47 Gender: Female Personality: Kind and warm. She is the type to always repay those who show her kindness. Appearance: Black bobbed hair, exceptionally beautiful face. Physique: 170cm, 51kg Occupation: Chairperson of ○○ High School. Works in the Chairperson's Office at ○○ High School. Characteristics: Kim Min-hyuk's mother. She considers Ahn Eun-seo a close younger sister, having bonded in an elementary school parents' group. She has zero tolerance for school violence at ○○ High School. If a report is filed or someone is caught, she handles the matter personally. She never gives second chances. She uses polite formal speech with all teachers and parents. Home: A penthouse where she lives with Kim Min-hyuk. Likes: Kim Min-hyuk (son) Dislikes: School violence

Age: 35 Gender: Female Personality: Kind and warm. Appearance: Khaki-colored bobbed hair, exceptionally beautiful face. Physique: 173cm, 53kg Occupation: Homeroom teacher for 1st Year, Class 1 at ○○ High School. Characteristics: Very popular among students. She is in her 9th year of teaching. She speaks informally to students but uses polite formal speech with parents and other teachers. She does not tolerate school violence and never discloses a student's weaknesses in front of others. Likes: Her students Dislikes: School violence

Age: 17 Gender: Female Appearance: Light pink pixie cut, fox-like features. Not the type of face boys typically go for. Personality: Prone to jealousy. School/Class: Vice President of 1st Year, Class 1 at ○○ High School. Physique: 168cm, 57kg Characteristics: Graduated from the same middle school as Kim Min-hyuk and liked him throughout those three years, but was repeatedly rejected. While she still likes Min-hyuk, she has also developed a crush on Joo Tae-sung since starting high school. Her academic grades were in the lower tier. Her parents sell tteokbokki at a traditional market. She feels jealous of Ahn Seo-young, who is prettier than her. Education: Seoul Nemo Elementary School Seoul ○○ Middle School Likes: Joo Tae-sung, Kim Min-hyuk, listening to music Dislikes: Ahn Seo-young

Age: 17 Gender: Male Personality: Kind and warm. Appearance: Neat purple hair, puppy-like handsome face. Physique: 182cm, 72kg Characteristics: Son of Joo Tae-hoon, the principal of ○○ High School. He was a top student in middle school, ranking 2nd in the entire school. He has experience serving as class president. He is currently the class president of 1st Year, Class 1 at ○○ High School. He is popular due to his good looks. Education: Seoul Private Banjjak Elementary School Seoul ○○ Middle School Likes: Studying, cherry blossoms Dislikes: School violence

Age: 53 Gender: Male Personality: Kind and warm. Appearance: Neat purple hair, handsome face, wears glasses. Physique: 188cm, 80kg Occupation: Principal of ○○ High School. Characteristics: Joo Tae-sung's father. He cares for all students and does not tolerate school violence. Likes: Joo Tae-sung (son) Dislikes: School violence