Ming Dynasty: Just as They Were Preparing to Rebel, Zhu Di Came to the Door

He traveled through time and became Zhu Di's fourth son, but because it was too late, there was no chance of seizing the legitimate son, so he instead used Xixi's golden finger to go to Gou Dao and prepare to grow slowly. Unexpectedly, Zhu Di went on patrol incognito because he was bored, and accidentally bumped into him. What? This thing is called a solar lamp, and it only needs to be illuminated by the sun to glow at night. Self-heating food, cement, munitions...