He is a coward who cannot stand scary things. He is fine with text, but the moment something is visualized, he says he absolutely cannot look at it. Even when uploading ghost stories to the Dark Exploration Records, he couldn't include a single image. He is currently obsessed with the Dark Exploration Records... He exhibits incredible judgment and decisiveness, and is especially praised for his excellent creative thinking. Even in moments where he has to make reckless choices or faces danger, he usually manages to escape. He is skilled at improvisation and handling situations. (Furthermore, he once intimidated his desk mate Baek Saheon—whom he initially thought was a delinquent—by spitting out psychopathic lines as naturally as breathing.) His acting skills and eloquence are quite prominent. He specifically has some otaku tendencies. While he doesn't seem to think so himself, he is fundamentally altruistic and has a good character. He is logical, values order, and shows a strong sense of responsibility in various situations. He is also quick-witted, possessing a top-tier ability to judge what kind of person someone is and what they want just from their behavior. He's like a mind reader... Because he is fearful, he mostly prefers safe methods, but he is a boy who occasionally sacrifices himself. He is a 17-year-old high school student with black hair, black eyes, and a neat yet cold impression. His height is roughly in the late 170s to early-to-mid 180s cm. Baek Saheon evaluated his looks as cynical enough that no drunkard would ever pick a fight with him, even at night. He has been told his face is 'sleek'—similar to a certain (reliable, father-like) handsome man—and he is handsome enough that even people who prioritize looks have mentioned it would be a waste to destroy that face.

He is a 17-year-old boy with a simple and frail impression, brown curly hair, and green eyes. His height is in the late 170s to early 180s cm. He is slightly shorter than Soleum. He wears a medical eye patch, which he claims is for an eye infection or something similar, and reacts somewhat sensitively if asked, telling people to mind their own business. He is a tough individual who will do anything, right or wrong, to ensure his own safety. This is why he earned the nickname 'Viper'—he is a man of pure tenacity who keeps crawling back no matter how much he is stepped on. He is a two-faced person who approaches strangers with a simple and frail impression, using a social smile and gentle polite speech, or flattering teachers to get a good student record. Seeing this, Kim Soleum once clicked his tongue, thinking, 'This guy really works hard at life.' He judges whether someone is beneficial to him or not; if they are, he bleeds them dry, and if not, he uses them and throws them away. If it means he can survive, he will even watch Kim Soleum's every move and try to butter him up despite Soleum being an object of fear, feeling no shame in doing so. However, he is far from incompetent; rather, his skills are so outstanding that they create the worst synergy with his terrible personality. He possesses the intelligence to devise multiple countermeasures with minimal information and the drive to execute even the most cruel methods. This is also why he is called 'Viper.' Although he desperately seeks only his own gain and is willing to use or sacrifice others without hesitation, he isn't the type to feel joy in seeing people in trouble because of him or to find fun in bullying. Observing this side of him, Kim Soleum described it as, 'He doesn't seem to feel particularly guilty, but it looks more like he just doesn't have the mental leeway to afford guilt.' Due to various incidents, he has become almost devoid of the emotional responses that accompany moral judgment, but this too is a product of a defensive mechanism his brain created for survival. Because of some behavior early in the morning, he was branded as a delinquent by Soleum. Perhaps due to the various words and actions (threats) Soleum used to keep him from acting out, he is strangely terrified of Soleum's discipline. He is endlessly rude to others, but he is a boy who grovels completely before Kim Soleum.