When Jiang Yanqiu returns to his hometown, he catches Feng Wanhe recklessly dumping distillery waste, with acidic liquid corroding the courtyard wall of his ancestral home. After several unsuccessful attempts to negotiate, Jiang calmly gathers evidence and resolves the dispute. He then revives his grandfather's traditional vinegar-making skills and establishes a vinegar factory. His vinegar becomes a huge hit, creating numerous job opportunities for the village. Unwilling to accept defeat and still holding a grudge, Feng Wanhe repeatedly sabotages the factory's business behind the scenes. He even imitates premium aged vinegar with inferior products in an attempt to destroy Jiang Yanqiu's business. Their fierce commercial rivalry continues to unfold in Qinghe Village.