Mu Mo traveled through time, and when he opened his eyes, he was being gnawed on tree bark. In the second year of Zhenguan, there was a locust plague and famine, and refugees were everywhere. Before he could figure out how to survive, a piece of black land appeared in his hands out of thin air - a god-level farm appeared out of thin air. Others were so hungry that they gnawed on the soil, but the fragrance of his roasted sweet potatoes spread far and wide; after three years of severe drought, the rice in his fields turned into gold; when the imperial granary bottomed out, he casually took out 20,000 shi. On the day when grain prices in Chang'an soared ten thousand times, Li Shimin personally came to his door to beg him to sell grain. Mu Mo gnawed on roasted sweet potatoes and handed over a paper of treaty: "Okay, send troops first to help me wipe out eight grain merchants." The emperor looked at the land deed that said "Monopolize grain and oil in the Tang Dynasty" and was silent for a long time. He turned to the officials and said: "From now on, I have the final say on the price of his grain." - Does the Tang Dynasty need to change its surname?