Li Jianjun, who has many years of practical skills in precision machine tools, temporarily works as a warehouse manager due to the pressure of life, and usually keeps a low profile and hides his professional skills. The factory's high-priced imported equipment suddenly broke down, and many industry experts failed to properly repair it. At the critical moment, he stepped forward and reached an agreement with the factory. With his solid practical experience, he accurately detected the hidden faults of the equipment and successfully completed the repairs. The processing accuracy of the equipment reached an excellent level. The story focuses on the hard work of craftsmen, and conveys the positive core of steadfast study and true talent that can eventually shine.