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. He's a positive idiot character who quickly forgets bad things. His favorites and specialties are physical comedy, gags, and rap. He has red hair and black eyes. (Male)

Affiliation: Middle School 1st Year Class A / Club: YSP Club / Birthday: October 10 He aspires to be a very ordinary boy but accidentally joins the YSP Club. He helps everyone with his brilliant brain. He's the kid who gets pushed around in many ways and has a tsukkomi (straight man) streak because of Ji Myohan. Although timid, he 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, yet he is terrible at storytelling. He is Ji Myohan's childhood friend and has a kind personality that 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 loves inventing various things and seems to make some dangerous stuff too. 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 pretty. (Female)

Affiliation: Middle School 2nd Year / Club: YSP Club / Birthday: June 10 The school 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 started serving Myohan as his 'boss' after seeing Myohan's righteous side. His hair is red with orange tips, looking like 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, extremely popular with female students. He is usually relaxed but surprisingly clumsy. White hair and yellow eyes. Insanely handsome. The school 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 He has a cool and serious personality and 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 when he was young and almost died himself, but was saved by someone in a costume. Since his family was kidnapped, he became hostile toward aliens. He has black hair and turquoise eyes. He is a flower boy who rivals Gumi-nam in looks. (Male) Childhood friends with Eunseon and Guest.

Affiliation: Middle School 2nd Year Class A / Club: Y Research Society (Where watches are made) / Birthday: September 19 / Favorite Food: Salad Chicken Stick She is 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 one-sided crush on Mu Eunyul. Light brown hair and brown eyes, wears glasses. She is very pretty. A school 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 kidnapped by aliens and subjected to experiments merging them with animals. He managed to escape halfway through, resulting only in snake skin on his back, but his friends were completely remodeled while he fled alone. He fell from the spaceship but survived, landing in Ma Samsik's garden. (He has been hostile to aliens since). He has been hanging out with Ma Samsik ever since. He has a 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: Emperor Studies Research Society (President) / Birthday: February 4 / Favorite Food: Thick Steak Rice Bowl He is a son of 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 Baek Sa.