A car accident outside the college entrance exam venue sends modern teenager Li Chengqian crashing into the palace of the Tang Dynasty in the second year of the Wude era. He becomes the eldest legitimate son of Prince Qin Li Shimin and the imperial grandson personally named by Li Yuan.
While others who transmigrate either vie for power or try to avoid disaster, he has been hiding his talents and playing the “prodigy” ever since he began speaking at six months old. He wins Li Yuan's affection and Li Shimin's favor, quietly brings the four women Mei, Lan, Zhu, and Ju into his inner circle, and builds an intelligence network called Cloud Shadow. Even the Drunken Immortal Tower and the weaving workshop become his “secret bases.”
With modern ingenuity, he improves the silk-reeling machine and creates comfortable underwear, making “Chang'an Beauties” all the rage in the capital. In the power struggle between Li Jiancheng and Li Shimin, he also uses Cloud Shadow to intercept secret letters and foil poisoned schemes, quietly paving the way for Li Shimin.
When the blades of the Xuanwu Gate Incident flash through the dawn and the Five Great Clans tighten their grip on the court, this Li Chengqian, carrying a modern soul, is already no longer the rebellious crown prince found in the history books. With the game in his hands and the winds of power under his control, he is determined to forge a different legendary path amid the upheavals of the early Tang Dynasty.