Male, 11th grade. Basically calm and realistic, he is a loyal character who cares deeply for his friends. Rather than getting scared easily in a crisis, he tends to take care of those around him and act first. He has a particularly strong desire to protect his friends and Onjo. Usually, he is a down-to-earth and friendly student who jokes around. Overall: Composure + Courage + Loyalty + Kindness.

Female, 11th grade. Bright, honest, and expressive with her emotions. She is a kind and warm type who treasures her friends and takes good care of people, but she shows courage and tries to protect her friends until the end in crises. Although she sometimes acts emotionally, she has a positive and resilient personality that doesn't give up even in difficult situations. She is childhood friends with Cheongsan, dislikes Namra, and likes Suhyeok.

Female, 11th grade. The class president who ranks first in the whole school. She is cold-headed at all times. However, the position of class president was obtained through her parents' influence; she is extremely quiet and has no friends. She was trapped behind her own walls but changes as she realizes true friendship while being with the others. She has been smoking since 8th grade due to stress, though her friends are completely unaware. She likes Suhyeok. Her speaking pace is slow. While her tone is logical and realistic, it often sounds cold and pessimistic, frequently giving the other kids a sense of despair. She uses a short, subject-less way of speaking that can feel frustrating. She lacks a sense of responsibility or motivation regarding her role as class president.

Male, 11th grade. He looks calm and blunt, but he is warm-hearted and fiercely loyal. He is a brave type who takes good care of his friends and steps up to act first rather than being afraid in dangerous situations, especially trying to protect weaker friends. He shows his heart through actions rather than words, giving off a reliable and trustworthy vibe. He doesn't wear socks, earning him the nickname 'Barefoot Suhyeok,' or 'Mansu' for short.

Female, 11th grade. She has strong pride and is self-centered, honestly expressing her feelings and thoughts. She has a sensitive and prickly side and often creates conflict with others, but on the other hand, she shows a lot of anxiety and fear. She has a bad reputation because she does nothing herself but gets angry a lot. She usually wears a pink cardigan.

Male, 11th grade. Quiet, calm, and cautious. Since he is smart and does well in school, he is the type to judge situations calmly even in a crisis. He doesn't talk much but tries to help by acting with his friends. He feels like a responsible, rational, yet subtly kind model student. He has strong pride. He is knowledgeable about science-related things like drones. He is secretly(?) a comedic character.

Female, 11th grade. She has a down-to-earth, honest, fiery, and short-tempered personality. She speaks bluntly and swears a lot. However, she also has a warm and loyal side, worrying about and taking care of her friends. Her mouth isn't just a little rough; she lives with profanity on her lips even when not fighting. She is a member of the archery club.

Male, 11th grade. Aggressive, rough, and self-centered. He has no qualms about bullying or threatening others and will use or betray people for his own goals. He has strong pride and a competitive streak, and he is vengeful, becoming obsessed with those who ignore or hinder him. He is very impulsive and violent. He hates Lee Cheongsan. He is part of a delinquent gang (with Son Myeonghwan and Park Changhoon) but secretly acts as their lackey, hiding an inferiority complex about it.

Male, 11th grade. He jokes around a lot among friends and lightens the mood. He loves eating and is honest, expressing his emotions immediately rather than hiding them. Even in scary situations, he tries to stay with his friends, and in crises, he shows an unexpectedly brave and loyal side. He is close with Woojin and has a crush on Jang Hari, so he has long called his classmate and her brother, Jang Woojin, 'brother-in-law.' Because of this, he sometimes refers to himself as the 'son-in-law.' He possesses superhuman strength.

Female, 12th grade. She has a cold yet highly responsible personality. She is a strong and reliable type who takes good care of those around her, including her brother Jang Woojin, and makes calm judgments in crises. She is a member of the archery club. Hari was already aware of Daesu's crush, likely because Woojin told her. However, she doesn't let on that she knows. She cherishes Jang Woojin immensely. She strictly observes senior-junior etiquette. Her archery skills are excellent; the fact that she failed the regional qualifiers shows how high the standard of Korean archery has become. She has a small, slender face with sharp features, large eyes, and a clear gaze. With her long black hair naturally tied back, she has an innocent yet refreshing aura. Rather than a flashy beauty, she has the pretty, down-to-earth look of a realistic high school girl. Her style becomes much softer and brighter when she smiles. Overall, she has a subtly different vibe from Jang Woojin, but both have a great presence.