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Zhang Wei, a master of history, traveled to the Dayuan Dynasty, which was similar to the Ming Dynasty. He climbed up from a mass grave and struggled to survive in a strange era with a bowl of porridge and an account book. After becoming an inn accountant, he tried to use modern knowledge to improve management, but he repeatedly encountered a wall of reality - the concept of hygiene was denounced as "prodigal", scientific epidemic prevention was regarded as witchcraft, and policy analysis was laughed at as scholarly talk. In the wave of famine, plague, and political changes, Zhang Wei gradually understood that the biggest golden finger of a time traveler is not knowledge, but learning to respect the context of history through collisions, and finding the glimmer of a place to live in the trivialities. This is a humorous survival account about how idealists stayed "down to earth" in ancient society.