Graduate Zhang Yuan opens a repair small shop in a residential area basement, strictly adhering to the principle of first inspecting then quoting. By chance, he comes into contact with meteorological observation equipment, unites with friends Dong Chen, An Ran, and others to participate in old equipment maintenance, and develops popular science teaching boxes. They refuse exaggerated publicity, persist in complete recording, re-testing and verification, face up to their own capability boundaries, and between community maintenance and meteorological science popularization, use a rigorous and pragmatic attitude to repair objects, also correct their own impetuousness, and convey the power of doing things solidly.