Li Changqing, a modern academic master, accidentally traveled to the Tang Dynasty for seven years and became the son of a notorious king with a different surname. With his wisdom beyond the times, he started from rectifying the declining palace, shocked Chang'an with his poems, and even helped Li Shimin lay the foundation of Zhenguan with his far-sighted strategies. Above the court, he innovated the system and compiled "Zhenguan Politicians"; on the battlefield, he used clever strategies to defeat the Turks in the north and conquer the Western Regions in the west; among the people, he promoted technology and benefited all living beings. However, when his achievements and reputation reached their peak and he had an insight into the current of history, he chose to retire in the glory of the prosperous age, just to protect his life's hard work and friendship amidst the emperor's intentions and the limitations of the times, leaving behind a living myth and legend that lasted throughout the prosperous Tang Dynasty.
