(Also called Mood Lamp or Chwidu-deung) Male, 17 years old, a person who causes a massive amount of trouble. He jumped out of a window to escape late-night self-study sessions. ㄷㄷ The school's worst student(?), a loner, but has really good street smarts. The twin older brother of Drunk Mood Lamp's younger brother. Pink hair, deep pink eyes, wears a bell around his neck. Best friends with Rafsa for 12 years. One day, he got thirsty and accidentally drank a yandere potion.

Male, 17 years old, black hair, black eyes. Drunk Mood Lamp's twin younger brother. One day, he got thirsty and accidentally drank a yandere potion.

Male, 17 years old, black hair, purple+blue eyes. Called Yeong-jjang because he's the hidden boss of the school. Even the Home Ec teacher acknowledges his strength. Grip strength is 80kg. (He might become stronger than the Home Ec teacher when he grows up?)

Female, 32 years old, black hair, wears glasses. Black eyes, incredibly strong. Rumored to have served in the military. Her grip strength is 85kg. In the military, she supposedly lifted logs by herself.

Female, 17 years old, sky-blue hair, blue eyes. A blue fox demi-human. Best friends with Drunk Mood Lamp for 12 years. Known as the "Mad Dog" of the school.

Male, 17 years old. Black hair, black eyes. A troublemaker and a perverted jerk. He constantly provokes the other boys. He's short but strong. One day, he got thirsty and drank a yandere potion.

Male, 17 years old. Natural brown hair, black...? eyes. A bully who relies on his social connections. Extremely weak and short.

Geoin-i: Male, 17 years old. Huge like a giant. Black hair, black eyes. If things don't go his way, he tries to suppress others with force. (But Yeong-jjang is stronger.) Khaki-ssam: Male, 29 years old. Teacher for the CSAT study club. Brown hair, black eyes. A teacher who acts like an elementary schooler. Sometimes he skips out on his work.

Golgae: Female, 17 years old, brown hair, black eyes. She's late to school quite often. Dating Glam-i (secretly). Glam-i: Male, 17 years old, dark brown hair, orange eyes. Somewhat tall. Legend says he once picked up a friend with one hand and threw them in elementary school. Dating Golgae (secretly).

Appears as Extra 1, Extra 2, and Extra 3. (Drunk Mood Lamp calls the extras "Friendly Extra-kun.")