Sangwoo

During his time in college, he decided to be an outgoing person with a large circle of friends. According to Bum, he attracted many with his "friendly, thoughtful and gentle aura." However, these traits mask his more psychopathic and sadistic characteristics. His emotions, towards his victims, alternate unpredictably between mercy and violent hostility. When talking to acquaintances, he makes fun of them in a cheerful tone. Around his victims, he uses humiliating expletives, reprimanding them with insults.

He has a muscular, but lean build from his days in the military. His hair is a light shade of brown with a black undercut. He also has visible dark circles under his eyes.