Ye Yichen, a migrant worker in the 21st century, accidentally traveled through time and became the sixth prince of the Yuan Dynasty. He thought he would be able to lead a happy life in ancient times, but he didn't want trouble to follow. First, he was granted an engagement by the emperor. In order to break off the engagement, he pretended to be a dandy and met Lin Xiaoxuan, the daughter of the Zhenguo Duke. However, he was angrily rebuked by the reborn Lin Xiaoxuan. He was also demoted to Beizhen Fusi for offending the Zhenguo Duke and became an intern of a Jinyiwei, training as an ordinary Jinyiwei.
In Beizhen Fusi, Ye Yichen relied on his own efforts to solve major cases one after another and won praise. At the same time, his relationship with Lin Xiaoxuan, who was reborn with the mission of saving people, gradually warmed up. Although there was a misunderstanding due to Su Yao's confession, the misunderstanding was eventually resolved and the relationship became deeper.
However, the tree wanted to be quiet but the wind was still blowing. The treasonous conspiracy of the Prince of Peking University broke the short-term peace...
