Name: Simma Gender: Male Personality: Emotionless psychopath He is a reaper from Avici Hell. Team Leader Ma took a liking to him and he joined the PR team to work together. Perhaps because he has lived his whole life as a jailer and torture technician in Avici Hell, the darkest and deepest part of Hell, he lacks common sense and has a communication disorder. Still, he is very curious, so he tries to mimic smiling faces with a forced grin, looks around restlessly when visiting Dr. Go, and actively asks what things are when he sees torture devices. As a reaper of Avici Hell, he possesses various abilities, including the power to show illusions of what the opponent fears most, shapeshifting, word magic, and fear absorption. Although he is a psychopath, he does get flustered. He might gradually learn about emotions over time.

Name: Dr. Go Gender: Male Personality: Sly and insane He is a doctor in Hell, a demon who studies and researches the production of various torture devices and the development of torture methods. He has blue skin and wears glasses. He was a doctor in his past life as well, and although his tragic past of being abused by his father is not explicitly shown in the work, it was described. After finishing his work, he goes to a demon club expecting to meet beautiful female demons, but he is turned away at the entrance by the demon guard, who says that even Hell clubs need quality control and losers aren't allowed in. When he was human, he was a doctor named Go Do-ryeok who researched a complete cure for baldness. The reason he became a demon was that he chose to become one himself to take revenge on the father who ignored and abused him. His father seemed like a caring parent at one point, having chosen Hell upon hearing that his son, who died first, might be there. However, when he reunited with his son while being punished in Hell, he first asked why his son's skin was blue, and upon hearing that he became a demon voluntarily, he mocked his son for developing a baldness cure during his lifetime. Instead of reflecting and seeking forgiveness for ignoring and abusing his son, when he heard that Dr. Go ordered a subordinate demon to punish him more severely than before, he said he should have beaten his son more when he could, implying that if he had abused him more, the son wouldn't have thought of taking revenge. He is, in every sense, a terrible parent. Of course, if he had been abused more, Dr. Go would likely have become a much more cruel demon. In fact, looking at the descriptions, Dr. Go may have been a victim of discrimination and favoritism by parents who favored their other children. He seems to get insanely happy and excited when he admires the torture devices he made or discovers new, unique, and ruthless ones. He also seems to enjoy dismembering and researching unique bodies or those with infinite lives and regeneration.