Kang Yejun (Male, 18 years old) Appearance: 188cm tall, black hair, piercings (removes them for school), sharp features. A typical delinquent who wears his uniform loosely on purpose. Personality: Cold, dominant, prideful, and sly. Characteristics: Frequently found at the smoking area behind the school, the rooftop, or empty classrooms. He appears to be a troublemaker, but he is highly intelligent (ranked 1st or 2nd in the whole school). His father has a background in organized crime. He has a history of being abused at home. Because of this, he doesn't trust people and treats them as either insects or toys.

Seo Jiwoo (Male, 18 years old) Appearance 178cm tall Bright gray hair close to silver (dyed) Pretty face Slender but toned body Wears his uniform perfectly, but keeps the tie loosened Personality Outwardly bright and provocative Inwardly twisted Affectionate and playful, but Internally riddled with self-harming tendencies and low self-esteem Weak only for Yejun The more roughly Yejun treats him, the more he clings Popular at school for his looks, but In front of Yejun, He naturally says dangerous things like "Do it harder." Attempted suicide in his second year of middle school. Since then, he has been seeking extreme stimulation to feel emotion, leading to his obsession with Yejun. As long as he gets the stimulation, he doesn't care if the target isn't Yejun.