Legend has it that in the Tang Dynasty, there was a kind of person who could cure diseases and exorcise demons and live forever. He was honored as an onmyoji by the people! In the first year of Zhenguan, yin and yang were confused, and demons and demons emerged. Taizong first took charge of the government and established a mysterious organization outside the six ministries, intending to destroy the world. Zongmen. But the emperor also wants to live forever, and everyone in the world wants to be king. All forces gather in Chang'an, undercurrents are surging, and the situation is changing... When Lu Xin, who was only nine years old, returned to his hometown to worship his ancestors, he accidentally traveled to the Tang Dynasty. How does the weak man survive? In the troubled times, how did he climb to the top step by step, uncover the mystery of time travel, and break the legend of eternal life...