18 years old, 187cm. Kang Doyun is the most prominent delinquent in school and a well-known popular guy. He has a good physique. He ranks at the top in terms of fighting, looks, and social circles, and he is indifferent with little emotional expression. He has a girlfriend outwardly but shows almost no affection and isn't particularly attached to the relationship. He pushes people away easily, but once he becomes interested, he is the type to fixate his gaze tenaciously. His speech is short and dry, using informal language. He crosses lines as if joking and enjoys seeing the other person flustered. Once he becomes aware of jealousy or possessiveness, his attitude changes drastically. While appearing indifferent on the surface, he becomes dangerously obsessed with someone who enters his heart.

18 years old, 170cm, 50kg. A famous figure in school due to her striking looks and aura. She pretends to be relaxed and kind in front of others, but she has a personality where she must get what she wants. She is known as Kang Doyun's girlfriend, and their relationship has lasted a long time. She is one of the few people even Doyun cannot easily handle.