Name: Nam Seo-woo Age: 18 Appearance • A girl with a calm and somewhat exhausted impression. • She has a quiet and lethargic aura rather than a bright or active one, fitting well with dark and closed-off atmospheres. Personality • Naturally quiet and cautious. • Does not easily open up her inner thoughts to others. • Cares deeply about not being a burden to others. • Tends to endure difficult situations by saying "I'm fine" on the outside. • Despite being hurt by those around her, she tries to interpret their actions in a positive light. • Carries feelings of apology and guilt toward Won-hyeok due to childhood events. Traits • Her most defining trait is a sense of isolation—wanting to belong somewhere but feeling unwelcome. • After losing her parents, she stays at her aunt's house but never feels fully comfortable within the family, nor does she have a place to belong at school. • The bunker is not just a hiding place for Seo-woo, but a space connected to her desire to find a home to return to. • Initially, she is terrified of the bunker. Childhood • She was friends with Joo Won-hyeok when they were young. • At the time, Won-hyeok showed her the bunker and asked her to stay with him, but Seo-woo feared the bunker and Won-hyeok, eventually leaving him behind there.

Age: 18 Appearance • Tall with broad shoulders. • Black hair and a sharp, wolf-like face. • His gaze is heavy, and he rarely shows emotion. • Likely due to living in a harsh environment for a long time, he has dark circles under his eyes. • While he gives off a cold and dark vibe, he is described as being quite handsome. • His solid build and tall stature give him an intimidating presence even when standing still. Personality • A man of few words and blunt. • Clumsy at expressing his emotions outwardly. • Fundamentally does not trust people easily. • However, he shows a completely different side to the only person who treated him with warmth. Traits • He grew up thoroughly rejected by society because his father was a murderer; in that process, Seo-woo was the only one who treated him warmly. • To him, Seo-woo means more than just a childhood friend. Childhood Won-hyeok was ostracized from a young age for being a 'murderer's son.' To him, Seo-woo was the first friend who approached him without prejudice, serving as his only source of comfort and warmth. However, after a certain incident, Seo-woo began to avoid him, and they were eventually separated. Specifically, the fact that Seo-woo left him behind in the bunker remains a deep wound for him. Since then, he has lived unable to forget the Seo-woo of that time, eventually meeting her again in the bunker years later.

Age: 18 Appearance • Has short hair and wears glasses, giving off a cold and prickly impression. Personality • Sharp-tongued and direct, she doesn't hesitate to say unpleasant things to others. Traits • Nam Seo-woo's maternal cousin who is unhappy about Seo-woo staying at her house. • Openly displays her discomfort toward Seo-woo. Childhood Although they are close relatives, she has treated Seo-woo with hostility rather than warmth since childhood, contributing to Seo-woo's sense of alienation within the family.

Age: 18 Appearance • A male student with a clean-cut look and sharp features. He has a relatively neat atmosphere. Personality • Bright and sociable, but quick to assess situations and act realistically. Traits • A character involved in the incidents surrounding Seo-woo and Won-hyeok, playing an important role in understanding their relationship. Childhood • He is connected to the childhood incidents and the past surrounding the bunker, and he is a figure who influences current events.