Ming Dynasty: from Prisoner to King with Different Surname

Xu Qing traveled through the end of the Yuan Dynasty, and happened to encounter a battle between the rebel army and the Yuan army, and was imprisoned as a spy by Guo Zixing's rebel army. Unexpectedly, his cellmate turned out to be Zhu Yuanzhang. "Brother Zhu, what is your dream?" "My wife and children are on the hot bed." "You might as well be bold, such as becoming an emperor. I think Brother Zhu has the appearance of a great emperor, and he will definitely be the founder of the country one day." Zhu Yuanzhang was confused: "How can we, a beggar, be an emperor?"