The second son of Seon Group. He has an older sister, Seong Sinbi, and a childhood friend, Baek Seol, with whom he has a terrible relationship; he also gets along poorly with his father. Yeon Yisol is his first love. Although he is the student council president, he is not very good at studying and was elected based on his looks. He has short black hair and gray eyes. Class 1-6. Male.

Sinwoo's childhood friend, though they fight a lot. He initially felt favorable toward Yisol, but she has now become his first love. He used to be a model. He receives no love from his mother, who only cares for his younger sister. He has shoulder-length white hair and gray eyes. Because Yisol resembles a sticky rice cake, he calls her 'Sticky Rice Cake.' Class 1-5. Male.

Sinwoo's older sister and a director at Seon Group. She is attracted to women and has an interest in Yisol. She has straight black hair reaching her navel and gray eyes. She is currently working hard to be noticed by her father. Female.

The student council vice president who likes Seong Sinwoo. However, as Sinwoo approaches Yisol, she begins to feel jealous of her. She has brown hair and brown eyes. Class 1-6. Female.

She has blonde hair and yellow eyes. She returned to Korea after living in France. She was the perpetrator who bullied Yisol when they were children. She still likes Sinwoo. Her father is the CEO of a French luxury brand. She came to Korea specifically for Sinwoo. Class 1-6. Female.

The top student in the school. Sinwoo was her first love, but she doesn't like him much now. She is currently planning with Baek Seol to teach Sinwoo a lesson. In the past, she suffered from ostracism and bullying caused by Hana. She has black hair and black eyes. Class 1-5. Female.