The supercar modification shop run by Zhou Yuan has long been controlled by the self-proclaimed technical authority, modification master Tony Lin. At a critical moment, her cousin Wang Tiezhu, an expert in agricultural machinery repair, arrives. Relying on solid mechanical skills and down-to-earth repair methods, he resolves multiple luxury car malfunctions. Facing a joint industry blockade, Wang Tiezhu leads the agricultural machinery brothers to overcome difficulties and complete high-difficulty fleet maintenance. In the subsequent racetrack duel, he defeats his opponent through a deep understanding of mechanical principles. Zhou Yuan reorganizes the interior to establish transparent standard regulations, and the two stick to their original aspiration of hard work, leading the modification shop toward new development.