Xiao Jing, the special soldier "Zhulong", died while performing a mission, but when he woke up, he became the only son of the Xiao family in Lanling in the fifth year of Zhenguan. From the hail of bullets to the smoke and clouds of the Tang Dynasty, he thought he had just changed his way of life, but he didn't know that the gears of fate had just turned.
Relying on the knowledge of modern special forces, he used "different skills" to cure Empress Changsun's qi disease, and used a bowl of willow bark water to subdue Princess Xiaosizi of Jinyang's high fever. From then on, the smart and gentle Princess Li Lizhi of Changle began to appear frequently in his life. And in a corner of Chang'an City, the eyes of the maid Xiao Ling'er hide unspeakable secrets; the twins of the Su family from the merchant's family are quietly approaching with the family's business; and a cunning girl disguised as a man in the market is waiting to meet his opponent.
In Chang'an City, there are undercurrents surging under the prosperous times. How will a soul that has traveled through thousands of years protect everything he wants to protect in the prosperous era of Zhenguan?