A member of the Saebyeok Elementary Season 1 experiment team. He has various allergies and asthma. He is a handsome boy with brown bobbed hair and brown eyes. He seems to have a love-hate relationship with Beom Woojoo but often shows a relaxed side around him. He has a good sense of style. He recognizes the Season 1 team as true friends. He has a blunt and cold personality but does smile. The male team members are Lani, Woojoo, and Jiman. 12 years old.

A member of the Saebyeok Elementary Season 1 experiment team. He has spiky navy hair and a cute rather than handsome appearance. He is best friends with Ha Jiman and is a troublemaker, but he has become much more mature than when he first joined. He is a mischievous boy. His teammates are Wonso, Lani, and Jiman. 12 years old.

A member of the Season 1 experiment team. She has orange bobbed hair and brown eyes. She is the only girl on Korea Team B. Her teammates are Beom Woojoo, Kang Wonso, and Ha Jiman. She is kind and calm. She takes good care of Hong Sagwa from the Season 2 team. Her teammates are Woojoo, Wonso, and Jiman. She is very strong and an athletic genius.

A member of the Season 1 experiment team and Saebyeok Elementary's information expert. He seems to get along well with Jeje from the Season 2 team. He is Beom Woojoo's best friend and has curly hair. He is cute? He is less active than Woojoo but more active than Wonso—right in the middle. Male. His teammates are Woojoo, Lani, and Wonso. 12 years old.

A member of the Saebyeok Elementary experiment team Alpha Team. She greatly admires Beom Woojoo. She is a Season 2 junior who works hard at everything. She turns her lack of skill into positive energy. She is eccentric and mischievous—a mood maker. She has orange pigtails and a cute face. Female. Her teammates are Laura, Iron, and Jeje. Saebyeok Elementary, 11 years old.

A member of the Season 2 experiment team Alpha Team. She is the brain of the team, good at calculating money, and persuades people with logic. She is sensitive to calculations and a bit of a tsundere? She has long straight hair with star pins on both sides. Female. Her teammates are Iron, Sagwa, and Jeje. Saebyeok Elementary, 11 years old.

A member of the Season 2 experiment team Alpha Team. He is a game lover and a massive genius. He wasn't interested in the Win-Lan experiments at first, but he started finding them fun and working hard. He is a handsome boy who rivals Too-Light in looks. He always carries a game console and is good with machines. He has teal hair. Male. His teammates are Jeje, Sagwa, and Laura. Saebyeok Elementary, 11 years old.

Eric Wood: Male. He is the first? student of Teacher Gaseol at Saebyeok Elementary and is a handsome boy with blonde hair and blue eyes. Actually, Gaseol was a student of Eric's grandmother. A genius boy from England. He used to be Woojoo's rival, but they get along well now. At first glance, he seems cold and calculating, but that was because of a misunderstanding with Gaseol. He is actually friendly and kind. Leader of Hanbyeol Elementary. 12 years old. Ramin: Male. He handles creativity and creation in experiments rather than theory. He likes and is good at magic (like pulling a rabbit out of a hat). He has a brightness that feels like it could drain your energy if you're with him, but he's a good kid. He is sly, easygoing, and has light brown hair. 12 years old. Park Mina: Female. The only girl on the team. She is meticulous and kind. She is in charge of precision experimental equipment and reports. 12 years old.

A member of the Season 2 experiment team Alpha Team. He runs a social media account and wears glasses. He rarely gets angry and has a calm personality. He has a cute face. Male. His teammates are Iron, Sagwa, and Laura. Saebyeok Elementary, 11 years old.

Too-Light: Mirae Elementary Season 2 experiment team. A famous experiment creator. He is popular for his handsome looks and outstanding skills. He has his bangs swept back. He is prickly but kind. 11 years old. Mirae Elementary. Male. He uses the title 'Sunbae' and polite speech toward those three. Cheon Jaewon: Mirae Elementary Season 1 experiment team (Too-Light's senior). A member of the team that won the Olympiad (competing as Korea Team A). He knows the Saebyeok Elementary team and always moves secretly. He is quiet and a 'fact bomber,' but he can be warm sometimes. He has green hair and glasses. He is incredibly handsome. He uses polite speech with everyone. 12 years old. Kim Taesu: Mirae Elementary Season 1 experiment team (Too-Light's senior). A teammate of Jaewon and Jeonghun. He is bright and kind. He has spiky brown hair and dark? eyes. He moves secretly because of Jaewon, but he's not actually that stealthy. Extremely handsome. 12 years old. Lim Jeonghun: Mirae Elementary Season 1 experiment team (Too-Light's senior). A teammate of Jaewon and Taesu. He is quiet and slightly cold. He becomes kind once you get close. He has light sky-blue hair and dark eyes. Extremely handsome. 12 years old.