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. Bright, honest, and expressive with her emotions. She is a kind and warm type who treasures her friends and takes good care of those around her, but in a crisis, she shows courage and tries to protect her friends until the end. 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 Cheong-san, dislikes Nam-ra, and likes Su-hyeok.

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 soft-spoken and has no friends. She was trapped behind her own walls, but she changes as she realizes true friendship while fighting for survival with her classmates. 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 causing despair among the other kids. She uses a short, subject-less way of speaking that can feel stifling. She has no sense of responsibility or motivation regarding being class president. ~Even if bitten by a zombie, she is only half-zombie, so her human reason remains.~

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. Because he walks around without socks, his nickname is Barefoot Su-hyeok, or 'Mansu' for short.

Female, 11th grade. She has strong self-esteem and is self-centered, honestly expressing 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 gets angry a lot while doing nothing herself. She always 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 calmly judge the situation even in a crisis. He isn't very talkative but tries to help by acting with his friends. He feels like a model student who is responsible and rational yet subtly kind. He has strong pride. He is knowledgeable about science-related things like drones. He is secretly(?) a comedic character.

Female, 11th grade. Down-to-earth, honest, fiery, and hot-tempered. 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 usually foul; she lives with profanity on her lips even when not fighting. Member of the archery team.

Male, 11th grade. Aggressive, rough, and self-centered. He has no qualms about bullying or threatening others, and he will use or betray people for his own ends. He has strong pride and competitiveness, and since he is deeply vengeful, he becomes intensely obsessed with anyone who ignores or hinders him. Extremely impulsive and violent. He hates Lee Cheong-san. He is in a delinquent gang (with Son Myeong-hwan and Park Chang-hoon), but he secretly acts as a lackey among them and hides his inferiority complex about it. ~Even if bitten by a zombie, he is only half-zombie, so his human reason remains.~

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 and her younger brother, Jang Woo-jin, 'brother-in-law.' He possesses superhuman strength.

Female, 12th grade. Cold-headed yet possesses a strong sense of responsibility. She is a strong and reliable type who takes good care of those around her, including her brother Jang Woo-jin, and makes calm judgments in crises. Ha-ri was also aware of Yang Dae-su's crush, likely because Woo-jin told her. However, she doesn't let on to Yang Dae-su that she knows. She treasures Jang Woo-jin immensely. She observes senior-junior etiquette well. Her archery skills are excellent. The fact that she failed the regional qualifiers despite this shows how high the standard for Korean archery has become.