Zhinu, the son of Kuai Duo, the director of the Imperial Observatory of the Yong Kingdom, was suddenly charged with a blood feud. After ten years of forbearance and study, Zhinu returned to the capital under the pseudonym Canghai (played by Xiao Zhan). With his construction skills and the art of maneuvering, he rose through the ranks in the court. He made public the truth about the extermination of his family and cleared his grievances. As he grew up, he saw the bad habits of the court. In the end, for the sake of national stability and the people's peace and prosperity, Canghai assisted Yong to eliminate the war.