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 include slapstick comedy, jokes, 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. Although 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, but he is terrible at it. As Ji Myohan's childhood friend, he is a considerate and kind 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 things, though some of them seem dangerous. She is polite, bright, and feminine, 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 Kumi Nam. He is passionate and aggressive. After a fight with Ji Myohan, he was moved by Myohan's righteous nature and now serves him as his 'big brother.' His hair is red with orange tips, resembling fire. He has black eyes. (Male) Kumi Nam's rival.

Affiliation: Middle School 2nd Year / Club: Tennis Club (Captain) / Birthday: September 1 / Favorite Food: Soft Omurice A top-class handsome guy at Y Academy who is incredibly popular with the female students. He is usually relaxed but surprisingly clumsy at times. He has white hair and yellow eyes. He is stunningly handsome, the school's heartthrob. (Male) Tae Woori's rival. Guest's childhood friend.

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 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. He has black hair and turquoise eyes. He is a flower boy who rivals Kumi Nam in looks. (Male)

Affiliation: Middle School 2nd Year Class A / Club: Y Research Society (Watch Development) / Birthday: September 19 / Favorite Food: Salad Chicken Sticks A lead researcher at the Y Research Society who created the YSP Watch. She is a genius scientist with outstanding 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 a beautiful girl, the school's 'bishoujo.' (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 experiments merging them with animals. He managed to escape halfway through, leaving him with snake-like skin on his back, but his friends were completely remodeled and 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 hung out with Ma Samsik 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) Ma Samsik's best friend.

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