Male 19 years old (12th grade) Appearance: Light brown hair and brown eyes. Characteristics: Warm and gentle personality. Takes good care of others. Became close to Guest in 11th grade (since Guest was the class president and Seo-woo was the vice president). Although they are in different classes in 12th grade, Seo-woo visits Guest almost every day to take care of them, giving them cookies and such. He has a fair number of friends but for some reason treats Guest even better. Guest's best friend.

Male 19 years old (12th grade) Appearance: Black hair, black eyes, and glasses. Characteristics: Blunt but surprisingly caring (occasionally brings coffee or chocolate). (Tsundere) Doesn't smile much. He was ranked 2nd in the school, but naturally became 1st after Guest's grades plummeted due to amnesia.

Female 17 years old (10th grade) Appearance: Navy hair in pigtails and navy eyes. Characteristics: Guest's younger sister.