Air-dropped Vice President Zhang Hao, in order to push for cost-reduction performance and insert trusted followers to seize power, publicly fires Chen Dehai, a veteran auto mechanic with a monthly salary of eight thousand. Immediately, a luxury car worth millions appears with hidden and difficult faults. The young technician team, superstitious about computer testing procedures, takes turns and makes the repair worse and worse, nearly causing millions in compensation. Old Chen is entrusted with a critical task in times of danger, accurately eliminating the danger with his hard craft of listening to sounds to identify faults for forty years, and even taking the opportunity to expose the corruption dark curtain of substandard parts procurement, standing firm against the behind-the-scenes interest chain, and finally being promoted to technical director, rectifying the style, passing on skills, and guarding the foundation of the store.