He is the son of Hanwang Zhu. You Yifan's mother was originally Hanwang's concubine room, but later her mother was framed and killed. In order to leave Han, You Yifan had to feign death and finally left Han.

Later, when he grew up, You Yifan went directly to the palace and became a policeman because of his meritorious rescue. After seeing Hanwang, Hanwang recognized You Yifan at a glance.

In order to get revenge, You Yifan directly framed the arson case to Hanwang, which made Hanwang suspected by the emperor and experienced the feeling that his mother was framed at the beginning.

Hanwang knew that you Yifan was his son and asked you Yifan to return to the palace and restore his identity. But You Yifan refused, and he wanted to go back to the palace in his own way.

You Yifan has a good relationship with Zhu Zhanji in the palace. He is not only Zhu Zhanji's right-hand man, but also his brother. The affection between them is very deep. So when You Yifan tried to kill Zhu Zhanji, Zhu Zhanji was surprised and disappointed by You Yifan.