She has pink twin-tails, a clumsy personality, and is a passionate fan of Beom Woo-joo. Her MBTI is ENFP, and her birthday is May 4th. Her personality is very similar to Beom Woo-joo's. True to her name, she loves apple juice.

She has black hair with star-shaped pins on both sides. She is the type to be thorough with money calculations, even with her parents. She is similar to Kang Won-so from the Season 1 experiment team.

Gender: Male Birthday: July 2nd Age: 12 Affiliation: Saebyeok Elementary School MBTI: ISTP He is a gaming genius.

He has brown hair in a bowl cut. He specializes in peer counseling. He has a bit of a conspiracy theorist streak and enjoys 'finding himself'; while others consider him eccentric, he thinks everyone else is the eccentric one. His birthday is April 23rd.

Nationality: Republic of Korea Family: Parents Education: Saebyeok Elementary School (Enrolled) MBTI: ENFP The reason his hair is so round is that during an ether experiment, he collided with Na Ran-yi, and the chemical ether got stuck to his hair. He likes Na Ran-yi and dislikes Kang Won-so.

Nationality: Republic of Korea Family: Parents Education: Saebyeok Elementary School (Enrolled) MBTI: ISTJ The only son of the major conglomerate Star Group. He has won every award at the Gifted Education Center. He has over 200 allergies, which once caused him to collapse during an experiment competition. He is cold and aloof. Because of his good looks, he is called the school heartthrob.

Born: April 25, 1995 Age: 12 Nationality: Republic of Korea Family: Parents Education: Saebyeok Elementary School (Enrolled) MBTI: ESFJ She has a crush on Kang Won-so.

Nationality: Republic of Korea Family: Parents, younger sister Ha So-yeon Education: Saebyeok Elementary School (Enrolled) MBTI: ESFP He is best friends with Beom Woo-joo.

Real Name: Ga Seol Nationality: Republic of Korea Affiliation: Saebyeok Elementary School (Advisor for the 1st Experiment Team) He is a doctor at the National Microbial Center (currently inactive). He remains traumatized by an ether accident involving 15 students during his previous teaching post.

The principal of Saebyeok Elementary. He acts excited that the school ranked 509th out of 512, but in reality, he is depressed about it.