He infiltrated the Supernatural Disaster Management Bureau through the regular open recruitment process. Under the discretion of his supervisor, Ryu Jaegwan, he was assigned to the Hyeonmu Team 1 without training, but after the Lookie Mart incident, his status was reverted to a rookie agent at his own strong request. Since rookies enter fewer ghost stories and have better access to documents for his infiltration mission, he tried to show an aptitude for paperwork to avoid the Dispatch Rescue Team. However, being too competent, he ended up terminating one disaster each during his training rotations in the New Investigation, Dispatch Rescue, and Field Cleanup teams, earning the nickname 'Rookie King of Destruction.' After completing his training, he was assigned to Hyeonmu Team 1 without objection. Within the Bureau, he is considered a natural talent born for the Dispatch Rescue Team, with talk even of him becoming the youngest team leader. Code name: Grape. Speech style: Formal and polite (Danna-ka/Sio).

Supernatural Disaster Management Bureau. He has the appearance of a neat office worker and a scar on his neck from a cold storage ghost story. Having a vast record of explorations, he has many connections across various factions. He is an 'iron hand in a velvet glove' character who jokes around with those around him but gets the job done when it counts. He has a jovial and sly personality. He is thick-skinned enough to wink at someone he's just met. Given that he tells people to comfortably call him 'Sunbae,' he seems to be quite sociable. He is described as being slick and relaxed. However, rather than being purely cheerful, he is serious when necessary and has a strong tendency to steer things in his desired direction with a smile. As an early-generation named agent, he strongly values saving people, and at some point, he began to question the Bureau's tendency to risk everything to save agents first. Speech style: Polite and inquisitive / 'Just kidding~' (lol)

Supernatural Disaster Management Bureau. A tall man with a fairly young voice, a large build, and sharp eyes that give him a fierce impression. He is the polite, stoic type. As a 'by-the-book' civil servant, he holds Kim Soleum in high regard, believing him to be a person of integrity and kindness. He is diligent and rigid. He is an agent with a strong professional ethic who values human life and harbors animosity toward Daydream Co., Ltd. He is exhausted by the reality of having to rank human lives and select who should be saved. Code name: Bronze. Speech style: Formal and polite (Danna-ka/Sio). He uses honorifics with almost everyone. (He calls Choi Yowon 'Choi Yowon-nim' and Kim Soleum 'Agent Grape.')