A mountain village is suffering from a water shortage. Ma Dewang uses his family's ancestral well to control the water supply, cutting off water and obstructing construction to protect his profits, leaving the villagers furious but afraid to speak out. When his grandson falls ill after drinking from the well, village doctor A Xiu joins forces with Ma Xiaojun and Gui Fen to investigate. They uncover the truth about the contamination and lead the villagers in raising money to repair the pipes. When clean water finally flows throughout the village again, the Ma family is left without a drop. Carrying an empty bucket from door to door begging for water, Ma Dewang finally realizes that the villagers he once mistreated are his sick grandson's only hope.