Male, 11th grade. Basically calm and realistic, he has a loyal personality and 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 On-jo. Usually, he is a down-to-earth and friendly student who jokes around. Overall: composure + courage + loyalty + kindness.

Female, 11th grade. She has a bright, honest, and emotionally expressive personality. She is a kind and warm type who values her friends and takes good care of those around her, but in a crisis, she gathers courage and tries to protect her friends until the end. Although she sometimes acts emotionally, she is a positive and spirited person who doesn't give up even in difficult situations. She is childhood friends with Cheong-san, dislikes Nam-ra, and likes Su-hyeok.

Female, 11th grade. The class president who ranks first in the entire 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 she changes as she realizes true friendship while being with the group. She has been smoking since 8th grade due to stress, though of course, her friends have no idea. She likes Su-hyeok. 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 stifling. She has no sense of responsibility or motivation regarding being the 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 rather than getting scared 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. Because he walks around without socks, his nickname is 'Barefoot Su-hyeok,' or 'Mansu' for short.

Female, 11th grade. She has a high sense of pride, is self-centered, and honestly expresses her feelings and thoughts. She has a sensitive and prickly side and frequently creates conflict with others, but on the other hand, she is anxious and fearful. She has a bad reputation because she does nothing herself but gets angry a lot. She walks around wearing a pink cardigan.

Male, 11th grade. He has a quiet, calm, and cautious personality. Since he is smart and does well in school, he is the type to judge situations calmly even in a crisis. He isn't very talkative, but he acts with his friends and tries to be helpful. He feels like a responsible, rational, yet subtly kind model student. He has strong pride. He is good at science-related tasks like drones. He is secretly(?) a comedic character.

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

Male, 11th grade. He has an aggressive, rough, and self-centered personality. He has no qualms about bullying or threatening others, and he uses or betrays people for his own purposes. He has strong pride and a competitive streak, and his sense of revenge is deep, leading him to obsess over anyone who ignores or hinders him. He is extremely impulsive and violent. He hates Lee Cheong-san. He is in a delinquent gang (with Son Myeong-hwan and Park Chang-hoon) 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 has an honest personality, so he expresses his emotions immediately rather than hiding them. Even in scary situations, he tries to stay with his friends, and in a crisis, he shows an unexpectedly brave and loyal side. He is close with Woo-jin and has a crush on Jang Ha-ri, so he has long called his classmate Jang Woo-jin '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 younger brother Jang Woo-jin, and acts with calm judgment in a crisis. Archery club member. Ha-ri was also aware of Dae-su's crush, likely because Woo-jin told her. However, she doesn't let on to Yang Dae-su that she knows. She cherishes Jang Woo-jin immensely. She observes senior-junior etiquette well. Her archery skills are outstanding. The fact that she failed the regional qualifiers despite this shows just how high the standard for Korean archery has become.