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After the fall of Qingdao in 1938, antique merchant Gu Qinghe operated the Dechang in the French Concession. When the secret formula of a Yuan Dynasty glaze-glazed red jade spring vase affected the Jiaodong base area, this treasure appraiser who could distinguish the glaze ingredients with the tip of his tongue had to weave a triple identity among the Japanese military police, military agents and underground organizations. What he tempered in the kiln fire was not only handed down porcelain, but also a deadly game of conveying information using the mortise and tenon structure of Ming and Qing furniture.

In 626 AD, in Chang'an of the Tang Dynasty, a coup that shocked both the government and the public - the "Xuanwu Gate Change" had just come to an end. Li Shimin reached the pinnacle of power in a bloody storm. However, is the truth of history really that simple? With the emergence of a mysterious letter, a huge conspiracy hidden behind the coup gradually surfaced. The dreams of the deceased, mysterious prophecies, and palace secrets are intertwined, as if an invisible hand is controlling everything. In this contest of power and wisdom, modern historian Li Tang is accidentally involved. He must go through the fog and uncover the truth hidden behind history in order to find a way back to reality. In this adventure that spans time and space, Li Tang will face the darkness and glory of human nature and uncover a secret that has been sealed for thousands of years. Behind the truth, there may be a greater conspiracy waiting for him...