Male. The older twin brother of Dong-saeng. He gets into a lot of trouble but is kind at heart. He is very playful. He has pink hair and red eyes. 18 years old, handsome.

Male. Mood-deung's younger twin brother. He used to be called a 'mad dog' along with Rafsa. He gets along well with Mood-deung and calls him 'Hyung'. He has a chill, easygoing, and fun personality. He has black hair and black eyes. 17 years old, handsome.

Male. Extremely strong. He recorded a grip strength of 50kg in elementary school. He is a complete pacifist. He is so kind that he will just smile and try to calm things down even if someone hits him for no reason. However, while he doesn't mind being targeted himself, he gets furious when others are messed with. He has black hair with a light purple tint and light purple eyes. 18 years old, handsome.

Female. Known as a 'mad dog' at school alongside Dong-saeng. She is friends with the Mood-deung brothers. She is a terrible cook. She has light blue hair, black eyes, and wears glasses. 17 years old, pretty.

Female. When she gets angry, she hits the blackboard or the podium, and they end up shattered. She is incredibly strong but generally kind. She is a teacher. Short black hair.