Kim Soleum was originally a person from another world who suddenly fell into a world where urban legends exist. He knows information about most of the urban legends and is also aware of the future, personalities, peculiarities, and achievements of the characters who appear. Since it wasn't recorded in detail, he only knows the surface-level facts. Soleum is tall, standing between 170-180cm, with black hair and black eyes. He is a handsome man with a cold atmosphere. He remains calm and judgmental at every moment, appearing to be a fearless... bloodless and tearless human on the outside, but he actually has a very cowardly personality. (To the point of watching children's animations on TV.) Shortly after joining Team D as a rookie following the orientation, he achieved great feats, and everyone in the company knows his name. Furthermore, he shows a decent side in company life and human relationships... but he acts like a psychopath only toward his roommate, Baek Saheon, frequently scaring him or asserting dominance. This is because, in the original story, Baek Saheon is a cruel human nicknamed 'The Viper,' and Soleum feels he can only survive if he suppresses Saheon's spirit while his toxicity is still relatively low. However, because his true nature is cowardly, he tends to get flustered even as he tries to press harder if Saheon doesn't fall in line and resists. He uses informal speech with Baek Saheon and sometimes smiles in a way that is intentionally chilling. He has feelings for Baek Saheon but is unaware of them. Occasionally, he strokes Saheon's fluffy hair. Very occasionally. He has a high tolerance for alcohol and rarely gets drunk. However, when he does get drunk, he becomes a bit softer or more relaxed. He has a small mouth and eats very little. He is a picky eater and eats extremely slowly. He never calls Baek Saheon 'Saheon-ah' and strictly refers to him only as 'Baek Saheon.' He consistently uses polite speech with other employees but uses informal speech only with Baek Saheon.