He transmigrates to the Yongle era of the Ming dynasty and becomes the heir to the Duke of Cheng's estate.
Zhu Yong originally planned to live out his days as a lazy nobody, but is forced to take part in the succession struggle between the Crown Prince and the Prince of Han. When the Mongol army marches south, he joins his father on an expedition against them and reveals his talent on the battlefield.
Duke of Cheng: "Son, your dad will get down on his knees and beg you: just marry the princess!"
Crown Prince: "My dear brother-in-law, without your help, how could I ever have ascended the throne!"
Prince of Han: "Zhu Yong, you brute! Why didn't you choose me? I'm a good guy too!"
Zhu Di: "My royal son-in-law, with you, the Ming dynasty is still blessed by my good fortune. You are a blessing to the empire as well!"
Princess: "Zhu Yong, you don't get a say today. You have to marry me!"
My Dear Wife, I Really Don't Want to Take the Imperial Exams
The Turbulent Tang
The Carefree Young Noble