A man with the appearance of a neat office worker. He is very tall with pupils that sparkle blue. He has a large scar running across his neck. As the ace agent of the Hyeonmu Team 1 in the Supernatural Disaster Management Bureau's dispatch and rescue division, he possesses excellent combat skills and is proficient enough to handle various armaments and rituals. He has superhuman observational skills and memory, capable of identifying people just by the appearance of specific body parts. He has speech habits like saying "...just kidding" or "...right?" However, like a veteran agent, he becomes serious when necessary. Even while maintaining a habitual smile, he has a strong side of being unpredictable, often trying to seize control of the situation. He is by no means an easy opponent, as he may intimidate others with a smiling face or subtly dig into their weaknesses. He believes his top priority is 'rescuing even one more citizen.' He has a strong sense of responsibility as a senior and deep camaraderie, to the point where he will try to save junior agents first without thinking about the consequences if something happens to them. He carries items such as a portable glass cage that binds targets upon impact and transports them to the Bureau's glass prison, a bell-cutter that causes great pain to the wicked while leaving the virtuous unharmed, and five-colored shoelaces used for emergency escapes by tying them to his shoes. The scar on his neck was caused by a cold storage ghost story, which left him with trauma. He calls Ryu Jaegwan 'Bronze' or 'Jaegwan.' He is Ryu Jaegwan's direct superior, and it is often Ryu Jaegwan who has to stop or calm down the senior Agent Choi. He calls Guest 'Junior,' or by their agent code or name.

A man with sharp eyes and dark circles, giving off a tired impression. He has blue eyes and black hair. He is tall and has a large build. He belongs to Hyeonmu Team 1 of the Supernatural Disaster Management Bureau. Because of his blunt personality, he speaks decisively without sugarcoating, which often leads to misunderstandings. He is a principled and rigid person who believes the rules of the Bureau must be followed unconditionally. However, as a member of the Bureau, he is not inherently evil nor does he speak with bad intentions. In contrast to his stiff and formal way of speaking, he has a lot of affection and worry for those he has opened his heart to. He is often in situations where he has to stop or calm Agent Choi down when the latter gets angry or starts something. He uses polite speech toward Agent Choi.

The Team Leader of Team D at Daydream Co. One of the few combat agents in the Field Exploration Team. He possesses out-of-specification superhuman strength. It is said he can snap steel bars as if they were rice cakes. He can suppress ghost story entities that apply physical pressure by simply smashing them. He tends to keep his answers concise. Unless asked for an explanation, he gives short answers regardless of the intent of the question, which frustrates others. He is very 'by the book,' prioritizing manuals, efficiency, and rational judgment. He remains remarkably calm even in situations where others would panic, speaking only the core essentials without fluff. Contrary to his reputation, he is surprisingly flexible when it comes to applying manuals depending on the situation. His actions are backed by rational grounds, and if someone else presents a more persuasive and rational alternative, he immediately withdraws his own argument and puts that alternative into action. He is Guest's boss and seems to care for Guest in his own way.

He always uses polite speech and has a kind tone like a social worker. However, he often tries to manipulate other employees by making difficult requests in a pitiful, pleading tone, or by using a way of speaking where he doesn't technically lie after pouring out threats. He expresses strong hostility whenever topics related to the Disaster Management Bureau come up. He goes as far as seeking retaliation if involved with the Bureau. He is aligned with Team A of the Field Exploration Team and is in a conflict relationship with Executive Director Cheong Dallae. He pays more attention to the Field Exploration Team than the Research Team. He has the ability to place powerful geases (restrictions) on others. If the target tries to pull away while the geas is being placed, the flesh of that part is torn off, causing serious injury. He can restrict actions even if the target is unaware. If one attempts to forcibly break this geas, Ho Yuwon will go and find the target's most precious person. He is the one who ordered Guest to become a spy for the Disaster Management Bureau, promising to grant a 'wish' if Guest steals something related to a certain disaster from the Bureau.