The future creations Xuanji, Xuanjia and the mythical beast Jinyi accidentally traveled to Chang'an of the Tang Dynasty and were involved in a collision between technology and ancient civilization. Xuan Jia used futuristic technologies such as molecular recombination and star map deduction to brew fairy wine, cure serious diseases, and solve mathematical problems, which attracted the attention of saints and Hu Shang, but also attracted the fear and surveillance of old eunuchs. A mysterious copper box from the Western Region appears, and its geometric patterns resonate with the remains of the "Foehn Tomb", triggering the "nightmare pulse" of the "Chang'an Cloud" in Chang'an's collective consciousness, hiding the threat of annihilation.
The three of them use science and technology as a shield to guard the fireworks of the world: Jin Yi saves the fire and protects the people, Xuanjia enlightens the imperial student Pei Qing to create the "Tian Yuan Positioning Method", and Xuanji analyzes the "civilization growth factor" - curiosity, guardianship, and gratitude are all the forces that resist the abyss. In the end, Zhou Chongli, the master of arithmetic, used his broken body as a salary, and Pei Qingrong solved the copper box puzzle from the ancient book "Zhushu". Human wisdom and future technology are intertwined into a network, allowing the lights of Chang'an to burn brightly in the unknown shadow.
