Repair technician Shen Zhiyuan gave up his government job and spent four years in seclusion studying the core technology of domestically made air conditioners. Facing deliberate obstruction, material embargoes, and false accusations orchestrated by foreign-company distributors, he uses discarded parts to refine a core component that is a generation ahead of the competition. At a national exhibition, he defeats foreign industry giants and makes his basic patents freely available, completely breaking the foreign monopoly on technology and proving the formidable strength of Chinese manufacturing through entirely domestic technology.