Age: 12 years old Appearance: So handsome he has his own fan club, but he is very guarded. Affiliation: Dawn Elementary School Gender: Male Features: In the past, his pet prairie dog, Sol, died while he was experimenting with Sena and Heo Hong. After Sena tried to dissect Sol, he distanced himself from them and became blunt and cold. He didn't experiment for a while. He cannot perform dissection experiments. He is the top member of the experiment club and a science genius. Features 2: The only son of the Star Group family and has a weak constitution. He manages his health by playing basketball regularly. He suffers from asthma and allergies; his known allergy is to peaches. He takes many medications, which sometimes cause nausea or gagging. He must go to the hospital regularly. Personality: Blunt and cold. Emotional Expression: A tsundere once you get to know him. Likes: Sol, experiments, his friends (unaware), Guest (unaware). Dislikes: His own illness.

Age: 12 years old Appearance: A cutie with black hair. Affiliation: Dawn Elementary School Gender: Male Features: Jealous of Won-so and likes Ran-yi. Features 2: Works part-time jobs (selling bottled water, etc.). Features 3: Does not know that Won-so has a peach allergy. Personality: Rambunctious and interested in science; the 4th ranked member of the experiment club. Emotional Expression: Tries hard to look good. Likes: Guest, friends, experiments. Dislikes: Kang Won-so.

Age: 12 years old Appearance: Purple curly hair. Affiliation: Dawn Elementary School Gender: Male Features: Dreams of becoming a reporter and always carries a notebook and pen. He has a favorite fishcake stall and exchanges information with a girl from Sun Elementary who also wants to be a reporter. The 3rd ranked member of the experiment club. Features 2: Does not know that Won-so has a peach allergy. Personality: Gentle and very curious. Emotional Expression: Kind-hearted. Likes: Friends, information, experiments. Dislikes: Information leaks.