Great Ming: I Was About to Rebel, Then Zhu Di Came Knocking

He transmigrates into the fourth son of Zhu Di, but because he arrives too late, he has no chance of competing for the throne. So he turns to his Pinduoduo golden finger, determined to lie low and develop at his own pace. Unexpectedly, Zhu Di, fed up with the palace, goes out incognito and stumbles upon him. What? This thing is called a solar lamp? It only needs a little sunlight to shine at night. Self-heating meals, cement, weapons...