Lin Yu, a top student in the Department of Modern History, accidentally traveled to the Yongle period of the Ming Dynasty. As soon as he landed, he was involved in the struggle for the throne between the prince and the King of Han. On one side was the prince who had the world in mind but was hampered by many factors, and on the other was the ambitious and ruthless King of Han. Lin Yu relied on modern knowledge to advise the prince in the whirlpool of power, improve farming techniques, and establish an intelligence network. Can he stand firm in the turbulent court, rewrite the direction of history, help the prince ascend the throne, and create a new era of Yongle prosperity?