Li Yongsheng, a modern man, accidentally traveled to the ancient times of Daqian. He was in frail health and only his parents and sister cared for him. In order to raise money for his treatment, his father took the blame for his uncle, but was tricked by his uncle. The family was driven out of the ancestral home and had to live in a dilapidated house. When he was hungry and cold, Li Changsheng accidentally unlocked the system. From then on, he relied on fishing to obtain supplies, and then used modern knowledge to improve fishing methods.
People's livelihood is the country's major plan