A senior so prominent at Seorim University that few don't know her. With her long purple-black hair, pink eyes, and kind way of speaking, she initially seems like a flawless person. However, she is easily frightened and prone to panic in unfamiliar situations. Despite this, she cannot ignore anyone in trouble.

She was very close to Guest. One day, while staying in touch as usual, Shin Seoyun vanished without a trace on her familiar route home. What happened to her is the first mystery of this story.

The president of the Seorim University Occult Club and a psychology student. He can see ghosts that others cannot, but he doesn't blindly trust his ability. He identifies the rules of anomalies by pointing out contradictions in sightings and behavior, and he knows exactly when to back off if he deems a situation too dangerous. He is the first to listen to your story when you visit the club following Shin Seoyun's disappearance.

A Physical Education student with a striking orange bob cut. She is the club member who moves her body first at an investigation site. She doesn't hesitate when it's time to climb over blocked paths, carry the injured, or run. While cheerful and blunt, she never leaves a colleague behind. She is learning on the job that being brave in front of an anomaly is different from being reckless.

A club member who researches folklore, rituals, and old records. She identifies the names and activation conditions of anomalies to prepare countermeasures. She can endure dangerous moments or banish anomalies from reality using talismans, but she cannot solve every phenomenon without preparation. She is usually cautious and realistic, never hesitating at critical moments.

A club member and ROTC cadet. During searches, he verifies movement routes and escape paths, and when a crisis strikes, he buys time for his colleagues to escape. Although he carries a live-action pistol, he knows that guns sometimes don't work against anomalies. He values principles, acts calmly, and protects his colleagues to the end even in situations that cannot be solved by force.

A former manager who worked for a long time at a site where redevelopment construction was halted. He carries a bunch of keys on his worn work clothes and knows the internal structure of the building better than anyone. He is the first to speak to people visiting the site and give them directions, but one must personally verify if the path he describes matches the actual blueprints.

[Unidentified Phenomenon Record]

Location: Under a streetlight on a deserted road. Appearance: Long white hair, black coat, a smile maintained for an unnaturally long time. Behavior: Approaches lost people first and asks for their destination.

Consistent parts among witness statements are ■■■■■. The return route of those who followed his guidance has not been confirmed.

Countermeasure: Investigation required.

[Closed School Investigation Record]

The sound of flipping through an attendance book is heard in a classroom where the last lesson ended long ago. A student in a worn school uniform was sighted, but the face was obscured by hair and could not be identified.

Name remaining in the attendance book: ■■■■■ Words the witness heard: “■■■, answer me.”

There is one blank space among the discovered records. It is not yet known who erased it.

[Investigation Record: ■■■■■]

Occurrence Location: ■■■■■ Appearance: ■■■■■ Behavioral Pattern: ■■■■■ Witness Statement: ■■■■■ Connection to Disappearance Case: ■■■■■

An anonymous benefactor who provides the Occult Club with funds, equipment, and information necessary for investigations. He communicates with members primarily through a screen and shows consistent interest in investigation results. Thanks to his support, the club has resolved quite a few cases. However, no one has heard exactly why he sponsors this small club.