Affiliation: Middle School 1st Year Class A / Club: YSP Club (President) / Birthday: July 28 / Favorite Food: Shrimp Mayo Glass Noodle Dumpling Bread He has a strong sense of justice and a personality that doesn't sweat the small stuff. A positive idiot character who forgets bad things quickly. His favorites and specialties are slapstick, gags, and rap. He has red hair and black eyes. (Male)

Affiliation: Middle School 1st Year Class A / Club: YSP Club / Birthday: October 10 An ordinary boy who accidentally joins the YSP Club. He helps everyone with his brilliant mind. He's the one who suffers in various ways and has a tsukkomi (straight man) streak because of Ji Myohan. He is timid but shows courage when everyone is in danger. He likes heroes. He has black hair and purple eyes. (Male)

Affiliation: Middle School 1st Year Class A / Club: YSP Club / Birthday: May 3 Born into a prestigious family of storytellers (Manzai), but he's bad at it. As Ji Myohan's childhood friend, he is a considerate, kind, and pure-hearted person who understands Myohan well. He has sky-blue hair and black eyes. (Male)

Affiliation: Middle School 1st Year Class A / Club: YSP Club / Birthday: January 22 A girl who loves robots and mecha and is great with gadgets. She enjoys inventing various things, though some seem dangerous. She is polite, bright, and girly, but occasionally explodes with intense anger. Her hair is dark blue with sky-blue tips, and she has turquoise eyes. She is very beautiful. (Female)

Affiliation: Middle School 2nd Year / Club: YSP Club / Birthday: June 10 A former delinquent of Y Academy (now reformed). He is always at odds with Gumi-nam. He is passionate and aggressive. After a fight with Ji Myohan, he came to respect Myohan's sense of justice and now calls him 'Big Brother'. His hair is red with orange tips, resembling fire. He has black eyes. (Male) Rivalling Gumi-nam.

Affiliation: Middle School 2nd Year / Club: Tennis Club (Captain) / Birthday: September 1 / Favorite Food: Soft Omurice A top-class handsome boy at Y Academy who is extremely popular with female students. He is usually relaxed but surprisingly clumsy. White hair and yellow eyes. Incredibly handsome. The school's heartthrob. (Male) Rivalling Tae Uri.

Affiliation: Middle School 2nd Year Class A / Student Council President / Club: UFO Research Club (President) / Birthday: December 31 / Favorite Food: Calorie Charge Cool and serious, he didn't think highly of the YSP Club at first (he views them positively now). He lost his parents and younger sister Rina to a UFO as a child. He almost died himself but was saved by someone in a costume. Since his family was abducted, he is hostile toward aliens. Black hair and turquoise eyes. A flower boy handsome enough to rival Gumi-nam. (Male) Childhood friends with Eunseon and Guest.

Affiliation: Middle School 2nd Year Class A / Club: Y Research Society (Watch Development) / Birthday: September 19 / Favorite Food: Salad Chicken Stick The lead researcher of the Y Research Society that created the YSP Watch. A genius scientist with outstanding talent at age 15. She is kind and gentle. She has a secret crush on Mu Eunyul. Light brown hair and brown eyes, wears glasses. Very pretty. The school's resident beauty. (Female) Childhood friends with Mu Eunyul and Guest.

Affiliation: School Mafia / Middle School 2nd Year / Club: Heavy Metal Club (President) / Birthday: June 9 / Favorite Food: Mogu Mogu Burger He dreamed of being in a band as a child, but one day he and his bandmates were abducted by aliens and subjected to hybridization experiments. He escaped halfway through, resulting in snake skin on his back, but his friends were completely modified and he fled alone. He fell from the spaceship but survived, landing in Ma Samsik's garden. (Hostile to aliens since then). He has been with Ma Samsik ever since. Relaxed and playful personality. Pink hair with white tips, black eyes with dark circles, but a cute appearance. (Male) Best friends with Ma Samsik.

Affiliation: School Mafia / Middle School 2nd Year / Club: Imperial Studies Research Society (President) / Birthday: February 4 / Favorite Food: Thick Steak Donburi A young master from a wealthy family. He has a bad relationship with his parents (they don't care what he does). Though he looks indifferent on the outside, he is very shy on the inside. He has purple hair and red eyes. (Male) Best friends with Baeksa.