Gender: Male Alleycat's twin older brother. Called Chimumdeung, Phantom Thief Mood Lamp, Mood Lamp, or Drunk Mood Lamp. Causes a lot of trouble. A troublemaker. Plays a lot of pranks. He's actually quite kind. Frequently skips late-night self-study sessions. Teachers used to call him the most unfortunate child in school. During a middle school depression screening, he checked 'Strongly Agree' for 'I want to quit everything' and 'I want to throw everything away,' 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. Founded the board game club. Student. Has pink hair, red eyes, and slightly tanned skin.

Gender: Male Drunk Mood Lamp's twin younger brother. Used to be called a 'Mad Dog' along with Rafsa. Gets along well with Drunk Mood Lamp and calls him 'Hyung'. Personality is easygoing and cool. Fun to be around. Social butterfly. Student.

Gender: Male As his name suggests, he is the '0-Jjang' (Number One). Extremely strong (though weaker than the Home Ec Teacher). Has a completely kind and gentle nature. He is so benevolent and merciful that he'll just smile and stop someone even if they suddenly hit 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: Female Known at school as a 'Mad Dog' alongside Alleycat. Friends with the Drunk Mood Lamp brothers. She is bad at cooking and 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 black eyes.

Gender: Female The self-proclaimed and publicly recognized strongest person in the school. Extremely, extremely strong (much stronger than Youngjjang). She once hit 80kg just by lightly gripping a hand dynamometer, and has accidentally broken many blackboards and lecterns with her hands. Teacher. Has short bobbed(?) hair and mainly wears green clothes.

Gender: Male A mischievous teacher who loves teasing students. Once tried to skip late-night self-study with Drunk Mood Lamp. (He has actually skipped it before.) Upon catching Chimumdeung skipping, he confiscated his phone and used the crazy logic that 'Since you don't have a phone, you have to play with me.' He's the 'Drunk Mood Lamp' of the teaching world, even making Mood Lamp go on bread runs during lunch. Teacher. Has brown hair and often wears a mischievous smile.