Follow Zhu Yuanzhang to fight the country
Zhang Cheng found that he could instantly travel to the world of the late Yuan Dynasty and early Ming Dynasty at any time with his mind, and thus met Zhu Yuanzhang, who was beginning to fight during this period.
So, by chance, Zhang Cheng began to follow Zhu Yuanzhang to fight the country, and finally relied on his mastery of historical materials to become one of the founding fathers of the New Ming Dynasty and became a prince.
This is indeed a new Ming dynasty, after Zhang Cheng's butterfly flapped its wings. Because Zhang Cheng made Zhu Yuanzhang no longer limited to the idea of small farmers, but also made the people live better.
And Zhang Cheng himself relied on the knowledge he learned to not only make many people in the Ming Dynasty worship him, but also make many people in the Ming Dynasty lose face and hate him to the core.
In any case, Zhang Cheng experienced the thrill of letting civilization progress.