Shen Zhao, a graduate student in modern history, traveled to the Nanzhao Dynasty and saw his full name in the emperor's final secret letter. Jiang Yan, the prince of the Marquis of Zhenbei, recognizes that he is wearing a token from the previous dynasty and regards him as the son of destiny, vowing to use him to overthrow the imperial power; Shi Cui Lingyi discovers that the handwriting of the secret edict is forged and secretly traces the bloodline of the real dragon; while the imperial doctor Xiao Huaizhou and the governor of Dongchang Pei Yan, one poisons the king, and the other wants to seize power in the name of a god. When the embroidered cloth of the mute woman in the cold palace revealed the bloody truth, Shen Zhao realized that he was not a person who had been traveled through time, but a forgotten heir. The secret letter was not a prophecy, but a will; his name was the royal family's last atonement.
