In the tenth year of Yongle, in a small courtyard on the outskirts of Beijing, Zhu Zhanyuan, who had traveled fifteen years, relied on the sign-in system and lived a life of fishing, drinking tea, and not caring about worldly affairs. However, because of a jade pendant engraved with the word "", he was closely entangled with the mystery of his life experience. He accidentally rescued Jingnan's orphan Sun Ruowei, accidentally got involved in a secret struggle for imperial power, and even formed an indissoluble bond with Yongle Emperor Zhu Di, who was disguised as a businessman "Old Man Ma".
Because his facial features resembled those of his missing eldest grandson, Zhu Di secretly tested and frequently cheated on him; Yao Guangxiao saw through the clues at a glance, but stopped trying to figure it out. When Zhu Zhanyuan accidentally obtained the unborn "Agricultural Administration Complete Book", this classic that could influence the foundation of the Ming Dynasty made him completely unable to stay out of the matter. On one side is the desire to live a stable life, on the other side is the whirlpool of the imperial power game, and on the other side is Zhu Di's warmth hidden under temptation. Zhu Zhanyuan is caught between salted fish and responsibility. He is forced to walk out of the small courtyard and face the truth of his life experience and the disputes in the court. A bond that spans identity and era begins.
