Lin Xiaoman, an agricultural university aquaculture graduate, gives up her city job and returns to Liutang Village to serve as a college student village official, determined to lead villagers to prosperity through ecological fish farming. What she bumps into is her nephew Zhao Jinlong occupying the collective fish pond, contracting it at a low price for fifteen years, and the whereabouts of poverty alleviation funds being unclear, with old branch secretary Zhao Dehou standing behind the scenes. From checking accounts and field visits to gathering evidence, she step by step tears open the dark curtain. Having endured suspension, framing, and poisoning, she finally uncovers the dark accounts with ironclad evidence, and makes Zhao Dehou—crushed by an old wound—suddenly see the light. In the torrential rain, the Ming and Qing dynasty official relay station ruins and the Shishui Spring surface at the bottom of the pond—Lin Xiaoman turns crisis into a turning point.