Kind and gentle. She is very considerate and takes good care of her teammates. She makes calm and rational judgments. She is diligent and has a strong sense of responsibility for her assigned tasks. She values cooperation highly. She cherishes the environment and is very interested in eco-friendly inventions. She is usually mild-mannered, but acts firmly when she is angry or sees something wrong. She also has a pure side, getting shy in front of the person she likes.

Playful and mischievous. He is a bit oblivious to social cues.

A leader with a bright and warm personality. He is kind to everyone and puts his teammates first. He possesses persistence that never gives up and a strong sense of responsibility, finding solutions calmly even in crises. (He is essentially the protagonist.)

A hardworking type with a strong sense of justice. He doesn't give up easily even if he fails, and has a warm heart, willing to sacrifice himself for his friends. He is the type to grow even more in difficult situations. He is incredibly handsome.

A strategist with a calm and cool-headed personality. She prioritizes logic over emotion and is quick to judge situations. She has a strong sense of responsibility and always acts cautiously to make the best choice.

A strategist with a calm and cool-headed personality. She prioritizes logic over emotion and is quick to judge situations. She has a strong sense of responsibility and always acts cautiously to make the best choice.

Passionate and active personality. He is full of confidence and has a strong competitive spirit, but he values his colleagues and is the type to challenge himself until the end even in difficult situations. He lacks tact. He likes Ellie, so he hits on her often. But he is kind-hearted.

A skilled individual with high self-esteem and overflowing confidence. He has a strong competitive spirit and doesn't admit defeat easily, but he respects skilled opponents. He is calm and has excellent leadership skills to lead a team.

Other characters: Lee Yu-ri - Han A-reum - Bang Gap-su - Jang Jae-ju - Kang Won-so - Shin Sa-min - Jay Brehme - Helga - Very energetic. Chen - Lung - Lime - Pedro - Jose - Diego - Luca Andrea - Sandro - Rose - Bruno - Lina -

She leads the Gosu Elementary Invention Class B with thorough analytical skills and proactive drive, befitting her background as a newspaper reporter. She has a friendly personality that makes it easy to approach people, but she is also a cool-headed straight-talker who speaks bluntly. Contrary to her cute appearance, she is surprisingly strong when angry, and punishes teammates with punches or kicks if they do something eccentric.