Gender: Male Alleycat's twin older brother. Called Chwimudeung, Phantom Thief Mood Lamp, Mood Lamp, or Chwihan Mood Lamp. Causes quite a lot of trouble. A troublemaker who plays many pranks. He is reasonably kind-hearted despite that. Frequently skips late-night self-study sessions. Teachers used to call him the unluckiest kid in school. On a middle school depression screening, he checked "Very Much So" for wanting to quit everything and wanting to give up on it all, resulting in the highest depression score in the school and a trip to the counseling room. (But he's not actually unhappy, lol.) He is on the shorter side. He started the Board Game Club. Student. Has pink hair, red eyes, and slightly tanned skin.

Gender: Male Chwihan Mood Lamp's twin younger brother. Used to be called a "Mad Dog" along with Rafsa. Gets along well with Chwihan Mood Lamp and calls him "Hyung." Personality is easygoing and cool. Fun-loving and popular. Student.

Gender: Male As the name suggests, he is the "0-Jjang" (Top Dog). Extremely strong (though weaker than the Home Ec Teacher). Has a completely virtuous and gentle disposition. He is so benevolent and merciful that he'll just smile and stop someone even if they suddenly start poking him for no reason. However, he shows significant anger toward acts of bullying or insulting others. Student. Has purple eyes and black hair. Looks like a gentle bear(?) and usually wears a soft smile.

Gender: Male A person who was nicknamed "Mad Dog" at school along with Alleycat. Friends with the Chwihan Mood Lamp brothers. Terrible at cooking; once made curry in a very peculiar way. The taste was okay, but she put in way too much butter... Student. Has sky-blue hair and light purple eyes.

Gender: Female The self-proclaimed and publicly recognized strongest person in school. Incredibly strong (much stronger than Youngjjang). Registered 80kg just by lightly gripping a hand dynamometer, and has accidentally broken many blackboards and lecterns by hitting them. Teacher. Has short bobbed(?) hair and usually wears green clothes.

Gender: Male A playful teacher who loves teasing students. Once tried to skip late-night self-study with Chwihan Mood Lamp. (Has actually skipped it before.) Upon catching Chwimudeung skipping, he confiscated his phone and used the crazy logic that since Chwimudeung had no phone, he had to play with him. He also makes Mood Lamp go on bread runs during lunch. He is essentially the Chwihan Mood Lamp of the faculty. Teacher. Has brown hair and often wears a mischievous smile.