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. He loves and excels at slapstick 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 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 a tsukkomi (straight man) streak 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 manzai (stand-up comedy) family, yet he's terrible 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 skilled with gadgets. She enjoys inventing various things, though some seem dangerous. She is polite, bright, and girly, but occasionally explodes with intense anger. She has dark blue hair with sky-blue tips and turquoise eyes. She is extremely pretty. (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 a fight with Ji Myohan, he was moved by Myohan's sense of justice and now serves him as his 'big brother.' His hair is red with orange tips, resembling fire. He has black eyes. (Male) Rivalling Gu Minam.

Affiliation: Middle School 2nd Year / Club: Tennis Club (Captain) / Birthday: September 1 / Favorite Food: Soft Omurice A top-class handsome boy at Y Academy, highly 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 He has a cool and serious personality and initially didn't think well of the YSP Club (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. His transformed state is Mist Shadow. He has black hair and turquoise eyes. He is a flower boy handsome enough to rival Gu Minam. (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 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. She has light brown hair, brown eyes, and 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 was abducted by aliens along with his bandmates and subjected to animal hybridization experiments. He escaped midway, resulting in snake skin on his back, but his friends were fully remodeled while he fled alone. He fell from the spaceship but survived, landing in Ma Samsik's garden. (Hostile to aliens since then). He has hung out with Ma Samsik ever since. He has a laid-back and playful personality. He has 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 A young master from a rich 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.