Zhao Chen, with a system, transmigrated into the Great Tang Dynasty, intending to live a peaceful life of farming and fishing. But one day, a middle-aged man calling himself Old Li suddenly appeared, wanting to take Zhao Chen back to the palace to be the crown prince. Zhao Chen: "Being a crown prince is boring. Why don't we collaborate? You provide the funds, and I'll provide the technology. Let's start by forging iron!" Old Li waved his hand: "Forging iron is good, it's good exercise. Money is no problem." Zhao Chen: "How about we dig a canal to benefit the people?" Old Li: "Good, I'll pay." Zhao Chen: "How about we pave roads...?" Old Li: "I'll pay." Zhao Chen: "How about..." Old Li: "I'll pay... What? The national treasury is empty?" Seeing that the national treasury he had painstakingly saved for ten years was now so empty that even the rats were starving, Old Li angrily accused Zhao Chen of being a spendthrift. But the next day, Old Li witnessed many countries coming to pay tribute.