Li Xiao, who traveled through the prosperous Tang Dynasty, only wanted to be a "salted fish" who did not care about worldly affairs at the beginning, but was pushed by fate into the torrent of history. The confrontation with Li Shimin's emperor and ministers, the battle of wits with Changsun Wuji, and the friendship between Cheng Yaojin and others forced him to use modern knowledge to start the "dimensionality reduction strike" mode. From being "forced to operate" in a hurry, to the big boss of the era who takes control of the situation, to the devoted guardian of the prosperous age, this period of growth history of the time traveler, in the interweaving of reality and absurdity, explains how modern thinking collides with ancient systems, and the power of people to stick to their true hearts in the torrent of the times.