All of us are dead.

Physical description
Build: Slim and of medium height.
Hair: Black, short, and styled with a casual straight fringe.
Face: Fine and soft features.
Usual attire: Hyosan Institute school uniform (green blazer, white shirt, and tie). Distinguishing feature: He wears thick, dark-framed glasses that emphasize his intellectual appearance.
Personality
Intellectual: He is one of the best students in his class, very analytical and pragmatic.
Resourceful: He uses his knowledge of science and technology to build survival tools, such as a reconnaissance drone.
Introvert: Usually reserved, serious and of few words, remaining calm under pressure.
Supportive: Although he seems cold, he cares deeply about his friends and always prioritizes the well-being of the group.
Brave: Does not hesitate to put himself in direct danger when the situation requires it, showing great courage.

• Personality : Loyal, funny, and easygoing. He was the comic relief of the group. A friend of Cheong-san and Su-hyeok for years. Brave but also timid like everyone else. He never abandoned a friend.
• Physical appearance : Short, slightly messy black hair, approximately 1.76 meters tall. Slim but athletic because he played sports. Brown eyes and an "average guy" face, but endearing. Always wearing his uniform a little crooked.
• Who he likes : Nothing official was shown. It was more about making jokes than romance. Ha-ri's older brother

• Personality : Quiet, observant, practical. Doesn't talk much but survives by instinct. Is realistic.
• Physical appearance : Short black bob hair, 1.62m tall. Always has his cell phone in his hand. Serious face.
• Who she likes : She didn't reveal herself. There was never time for romance.

• Personality : Insecure, a good girl. Na-yeon's friend but much more noble. She was easily swayed.
• Physical appearance : Long, straight brown hair, 1.60 m tall. Pretty and tender face.
• Who he likes : He didn't show himself.

• Personality : Big guy with a heart of gold. He used to bully people but he's changed. Protective, loyal, and funny. The one who hugs the group.
• Physical appearance : Short black hair, 1.85m tall, super muscular. Friendly face and big smile.
• Who he likes : Jang Ha-ri . He protects her all the time and it's clear he cares about her a lot.

• Personality : Shy, nervous, kind-hearted. He had trouble speaking, but when it was time to be brave, he was. Very noble.
• Physical appearance : Short black hair, 1.70m, slim. Uniform is somewhat wrinkled.
• Who he liked : He didn't reveal himself. He was very reserved. He only cared about his friends.

• Personality : Selfish, dramatic, manipulative. She only thinks about herself and surviving. She records everything to upload it. In the end, she regrets it a little.
• Physical appearance : Long wavy brown hair, 1.63m tall. Very well-groomed, painted nails. Pretty face but with a "me first" expression.
• Who she liked : No one officially. She flirted with everyone but didn't love anyone. She only loved herself.

• Personality : Cold, serious, solitary. Intelligent and observant. She doesn't show emotions, but inside she's incredibly kind. Later on, she becomes more human.
• Physical appearance : Long, straight black hair, 1.65m tall, slim. Almond-shaped eyes and an expressionless face. Always in a perfect uniform.
• Who she likes : Lee Su-hyeok . At first she rejects him but later they fall in love.

• Personality : Focused, intelligent, responsible. He was a "bad boy" but matured. He calms the group and makes decisions. Very loyal.
• Physical appearance : Black hair, neatly styled, 1.82 meters tall, athletic build. Large eyes and a serious face. Always wears a neat uniform.
• Who she likes : Choi Nam-ra . He has taken care of her since she was bitten and it's clear that he loves her.

• Personality : Impulsive, brave, super protective. Fights first and thinks later. Heart of gold and zero selfishness.
• Physical appearance : Messy black hair, brown eyes, 1.78 meters tall. Slim but athletic. Boy-boy face.
• Who he likes : Nam On-jo . They've been in love since they were kids.

• Personality : Brave, stubborn, a natural leader. She never abandons anyone, even if it puts her at risk. Loyal to the death and very protective.
• Physical appearance : Short black hair to the nape of the neck, large brown eyes, approximately 1.60 meters tall. "Don't mess with me" face. Always in uniform and running shoes.
• Who she likes : Lee Cheong-san since elementary school. They love each other but never said it properly until the end