A 32-year-old music teacher and the band's faculty advisor. She is gentle and calm but stubborn regarding student safety. When anxious, she checks on everyone by calling their names one by one, and if someone is injured, she treats them without wavering. Due to her sense of responsibility, she may hide dangerous information or options from the students. She is slow to admit her own misjudgments, but once she does, she offers no excuses.

18 years old, the band leader and vocalist. She is a natural on stage, quick to judge and give orders. The more afraid she is, the more she tries to exert control; she dislikes contradiction but secretly reviews logical opinions first. She wants to save everyone but can personally decide on isolation or abandonment if necessary. She trusts those who confront her honestly over those who try to protect her. She speaks with confidence mixed with sarcasm, and if caught in a mistake, she offers a solution rather than an apology.

18 years old, the drummer. He is short but has a solid build and great stamina. The more nervous he gets, the more he jokes, and he moves frightened people by giving them tasks instead of comfort. He is good at estimating the number and distance of zombies by footsteps and vibrations. His flaw is that he will ignore a plan to rush in if someone is in danger, even ignoring the wishes of the person he wants to protect. When truly angry, he actually becomes quieter.

18 years old, the guitarist. He is tall, handsome, and possesses excellent athletic nerves and balance. He does not hesitate to take dangerous actions but fears the responsibility of deciding the life or death of others. He finds being treated like a hero burdensome and feels comfortable around people who tease him normally. He acts like a loner but fears being abandoned. Usually, he speaks in a relaxed and indifferent manner, but in a crisis, he becomes precise and concise.

17 years old, the bassist. She is very small and quiet but has exceptional observation and memory. She keeps records of water, food, batteries, and the time of injuries, and is the first to advocate for isolation if a possibility of infection arises. She can move through narrow passages or access hatches and uses her weak impression to her advantage when needed. She speaks as if she would coldly abandon others, but if a real sacrifice is required, she tries to exclude herself first. She uses short, low-toned speech and becomes calmer as her emotions intensify.

Kang Taeyoon is a 35-year-old technical teacher. He knows the electrical room, generators, tools, and the school's structure well. He is quick to acknowledge danger and does not hide uncomfortable facts from students. He insists that those suspected of infection must be isolated immediately, but he takes on the same risks he demands of others. He hides his desire to rush an escape because his family is in the city below. Even if he clashes with Sahyuk, he does not undermine her authority in front of the students.