In the 1970s, a century-old drought hit the rivers and wells, putting Zhang Jianguo's family and villagers in a deep existential crisis. After his rebirth, he changed from being timid and cowardly in his previous life. While digging a cellar, he accidentally discovered an underground cave and underground river. There was abundant water and fresh fish in the cave. With this God-given resource, he led his family out of trouble, helped the villagers fight drought, uncovered a conspiracy that had been hidden for many years in the process of avenging his father, and gained true love. He used courage and wisdom to rewrite a rough fate, and wrote a chapter of struggle in a special era.