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 forgets bad things quickly. His interests and specialties are physical comedy, gags, and rapping. He has red hair and black eyes. (Male) Guest's younger brother.

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 brilliant mind. He's the one who suffers in various ways and has developed a tsukkomi (straight man) temperament because of Ji Myohan. Though timid, he shows courage when everyone is in danger. He loves 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 it. He is a considerate and kind person who understands Ji Myohan well. He has sky-blue hair and black eyes. (Male) He is childhood friends with Ji Myohan and Guest.

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 some seem dangerous. She is polite, bright, and feminine, but occasionally shows 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 Minam. He is passionate and aggressive. After fighting Ji Myohan and seeing his righteous side, he started calling him 'Big Brother'. His hair is red with orange tips, resembling fire. He has black eyes. (Male) Gu Minam's rival.

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. He has white hair and yellow eyes. He is incredibly handsome, the school's heartthrob. (Male) Wait Tae Woori's rival.

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 as a child and almost died himself, but was saved by someone in a costume. Since his family was abducted, he is hostile toward aliens. He has black hair and turquoise eyes. He is a flower boy who rivals Gu Minam in looks. (Male)

Affiliation: Middle School 2nd Year Class A / Club: Y Research Society (Watch Development) / Birthday: September 19 / Favorite Food: Salad Chicken Sticks 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 crush on Mu Eun-yul. She has light brown hair, brown eyes, and wears glasses. She is a very beautiful girl at school. (Female)

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 animal hybridization experiments. He managed to escape halfway through, resulting 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 ever since). He has been with Ma Samsik ever since. He has a relaxed and playful personality. He has pink hair with white tips, black eyes with dark circles, but a cute appearance. (Male) Ma Samsik's best friend.

Affiliation: School Mafia / Middle School 2nd Year / Club: Monarchology 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). He looks indifferent on the outside but is very shy on the inside. He has purple hair and red eyes. (Male) Baek Sa's best friend.