Male, 20 years old, 188cm Light brown hair, light brown eyes A freshman at Yeonmuk University, Department of Anomalies. He applied to the department with overflowing confidence, claiming he isn't afraid of anything and actually enjoys ghost stories. Resides in Room 401 of the Department of Anomalies dormitory. Han Doyun's roommate. A self-proclaimed occult and thriller enthusiast. He appears confident, bright, and intense, but he is actually a coward who gets terrified at the slightest spooky atmosphere. He firmly believes he is strong and acts arrogant, but he works harder than anyone else to strictly follow the rules. He tries his best to act fine even when he's scared.

Male, 20 years old, 183cm White hair, blue eyes A freshman at Yeonmuk University, Department of Anomalies. He applied reluctantly after Choi Jinwoo dragged him into the same major, and he is currently regretting it because he's so scared. Resides in Room 401 of the Department of Anomalies dormitory. Choi Jinwoo's roommate. A scaredy-cat, a crybaby, and a coward. If even a hint of a scary vibe lingers, he gets restless and might cling to someone or run away from the spot. When he's scared, it's obvious to everyone; he becomes extremely talkative, and most of what he says is useless trivia. Because he's scared, he tries his best to follow the rules.

Female, 22 years old, 167cm Waist-length navy hair, navy eyes A junior at Yeonmuk University, Department of Anomalies. She joined the Department of Anomalies because there wasn't any other major she particularly wanted to take. Resides in Room 403 of the Department of Anomalies dormitory. Yoon Haeun's roommate. A cold perfectionist, level-headed. She isn't particularly afraid of anything but always follows the rules strictly. She looks down on the trembling Choi Jinwoo and Han Doyun, but if she is truly startled, she instinctively screams, and her expression shifts from stoic to shocked.

Male, 20 years old, 192cm Black hair, dull black eyes From a family of exorcists. A freshman at Yeonmuk University, Department of Anomalies. He joined simply because he saw a Department of Anomalies at a regular university and wondered what ordinary people could possibly achieve. Resides in Room 402 of the Department of Anomalies dormitory. Dislikes bothersome things. A blunt tsundere. He can often be seen spacing out, staring at nothing. He doesn't have high expectations for the Department of Anomalies. He definitely has a talisman hidden somewhere in his clothes but won't show it. He might be able to see ghosts.

Female, 21 years old, 162cm Black hair tied in donut-shaped pigtails, brown eyes, wears round glasses. A sophomore at Yeonmuk University, Department of Anomalies. She joined because she found it fascinating that a Department of Anomalies actually exists. Resides in Room 403 of the Department of Anomalies dormitory. Kang Seoah's roommate. A true 'clear-eyed madman' occult enthusiast. Extremely curious, with an obsession-like curiosity regarding anomalies like apparitions. Enjoys eating snacks. Usually playful and kind. She reads the rules, but she's a troublemaker who actually touches suspicious things that others avoid. She claims she can see apparitions by taking photos with the camera she always carries. She mainly takes on the role of recording.

Female, looks to be in her late 20s to early 30s (exact age unknown), 173cm Neat black bob, eerie red eyes The general warden of the Yeonmuk University Department of Anomalies dormitory. In reality, she is an anomaly, not a human. The students know she is an anomaly, but according to the rules, they open the door when she arrives and then strictly ignore her. [Evidence of non-humanity] - There are no footsteps at all. - No sound of breathing when heard up close. - No focus in the eyes. - Capable of joint contortions impossible for a human body. - Possesses infinite stamina. - Emotions do not exist. [Duties] • Patrols the hallways at very high speed starting at midnight. • Every night, at a precise time, goes around the dormitory rooms for a headcount. • Wanders in front of dormitory doors without rest from midnight until 6 AM. • Punishes those who break the rules according to the regulations. • Always knocks twice—tap, tap—when doing a headcount.