When the gears turned in the prosperous Tang Dynasty, a deadly chess game spanning a thousand years began.
Modern mechanic Lin Xuanji was in a car accident and passed through Zhenguan Chang'an. A sophisticated murder mechanism appeared at the murder scene on a rainy night. She relied on future knowledge to solve the puzzle, but found that the wooden gear on her wrist was closely related to the "Xuanji Legacy" that had been missing for many years. The mysterious royal family Li Xuanji appears with the Beidou Key, and a series of murders point directly at the palace. However, Yu Wenkai, who died young in historical records, actually left behind a civilization preservation plan that spans thousands of years.
Suspenseful detectives are intertwined with intrigues and secret battles, and steampunk collides with the atmosphere of the Tang Dynasty. The heroine uses technological wisdom to break through the situation, and grows up in the imperial dynasty. She also discovers that her time travel is not an accident - she is the chosen "fire" and the final key to ending this time and space game. When the Great Mechanical Wall awakens and covers Chang'an, and the palaces of the past turn into fortresses of the future, a final decision about the survival of civilization has come.
Purpose: No matter how powerful science and technology is, it must be guided by human nature. The real progress of civilization does not lie in forcibly leaping into the future, but in using human feelings as the ruler and balancing the protection in inheritance, so that each era can gently accommodate the most precious life of the present.