On the day of his longevity banquet, elderly Shen Changgeng of Liuxi Village is hunted down by underworld emissaries for his life, and King Yama personally descends to investigate, uncovering the secret of how he has lived for five hundred and twenty years. It turns out that in his youth he gave up his family property and risked death to fight a flood, saving hundreds of villagers and earning a life extension granted by the Heavenly Dao. For five hundred years, he continuously shared his merit with the villagers until his allotted lifespan was nearly exhausted. When a flood strikes the village once again, he holds back his habit of shouldering everything alone and guides the villagers to work together to hold the river dike. In the end, he peacefully bids farewell to his family, while kindness continues to be passed down in the hands of the new generation.