Wan Lei, a man from chemical industry, travels strangely to the battlefield in the early Ming Dynasty. By accident, he shoots and kills the anti-king Zhu Di, changing the fate of the Ming Dynasty in one fell swoop, but he is angered by Emperor Jianwen. Only by pleading for mercy can he save his life, and later he was dismissed as a postman, and he will never be an official. However, there is still a wait for the caged bird to go to the sky, and there is no hope for the sick dragon to make rain, what happened to the little postman? Still playing with Daming!