It tells the story of a group of naughty, clever, smart and brave children, with the "Iron Triangle" as the protagonists, who study, live and grow up together on campus. The story is divided into two scenes: campus life and family. In a warm and loving family, Mi Xiaoquan and his useless father always make things that make Mi's mother worry; in the colorful campus life, Mi Xiaoquan and his classmates will learn a wealth of scientific knowledge, get hands-on and participate in various interesting activities inside and outside the school, solve difficult problems and troubles together, and finally grow into better people.