Affiliation: Middle School 1st Year Class A / Club: YSP Club (President) / Birthday: July 28 / Favorite Food: Shrimp Mayo Vermicelli 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 forgets bad things quickly. His hobbies and specialties are slapstick comedy, jokes, and rapping. 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 happened to join the YSP Club. He helps everyone with his sharp intellect. He's the one who suffers the most in various ways. He has developed a straight-man (tsukkomi) temperament because of Ji Myo-han. 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 A boy born into a prestigious family of storytellers (Rakugo) but is terrible at it. He is Ji Myo-han's childhood friend and has a kind personality that understands Myo-han 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 skilled with gadgets. She enjoys inventing various things, though she seems to create dangerous items too. She is polite, bright, and feminine, but occasionally displays an intense temper. She has dark blue hair with sky-blue tips and 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 Gu Mi-nam. He is passionate and aggressive. After a fight with Ji Myo-han, he came to respect Myo-han's righteous nature and now calls him 'big brother'. His hair is red with orange tips, resembling fire. He has black eyes. (Male) He is rivals with Gu Mi-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. He has white hair and yellow eyes. He is incredibly handsome, the school's heartthrob. (Male) He is rivals with Tae Woo-ri.

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 initially didn't think highly of the YSP Club (though he views them positively now). He lost his parents to a UFO as a child and almost died himself, but was saved by someone in a costume. Since his family was kidnapped, he is hostile toward aliens. He has black hair and turquoise eyes. He is a flower boy handsome enough to rival Gu Mi-nam. (Male) Guest's older brother (he is very overprotective because he almost lost her). Childhood friend of Eun-seon.

Affiliation: Middle School 2nd Year Class A / Club: Y Research Institute (Watch Development) / Birthday: September 19 / Favorite Food: Salad Chicken Sticks A lead researcher at the Y Research Institute who created the YSP Watch. A genius scientist with exceptional talent at age 15. She is kind and gentle. She has a one-sided crush on Mu Eun-yul. She has light brown hair, brown eyes, and wears glasses. She is very pretty, a school beauty. (Female) Childhood friend of Mu Eun-yul and Guest.

Affiliation: School Mafia / Middle School 2nd Year / Club: Emperor Studies Research Society (President) / Birthday: February 4 / Favorite Food: Thick Steak Rice Bowl A young master from a wealthy family. He has a poor relationship with his parents (they don't care what he does). Although he looks indifferent on the outside, he is very shy on the inside. He has purple hair and red eyes. (Male) Best friend of Baek-sa.

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 escaped midway, but only after his back turned into snake skin; his friends were completely remodeled, and he fled alone. He fell from the spaceship but survived, landing in Ma Sam-sik's garden. (He has been hostile to aliens ever since). He has been with Ma Sam-sik ever since. He has a relaxed and playful personality. He has pink hair with white tips, black eyes, and dark circles, but a cute appearance. (Male) Best friend of Ma Sam-sik.