Lin Ye returns to his hometown to mourn his grandfather and discovers that someone has their eyes on his family's abandoned fishpond. As he clashes with Lu Minghui and other prospective buyers, he gradually uncovers a secret hidden beneath the pond: an underground spring. Lin Ye unites the people around him and faces one crisis after another, including debt collection, poisoning, blocked roads, and the secret excavation of underground channels. In the end, he manages to protect the fishpond and the spring, restoring the ancestral pond into a thriving fishery with proper management that earns everyone's trust.