Auto mechanic Gu Zechuan is looked down upon by his mother-in-law, but he is actually a former diagnostic team leader of a top racing team. When his wife's luxury car dealership encounters a technical problem and German experts are helpless, Gu Zechuan steps in and quickly resolves the fault. Faced with a high-paying job offer, he chooses to stick to his ordinary position, which triggers family conflicts and workplace storms, and ultimately wins respect with his exquisite skills.