Zhan Zhanqing returned from his study tour and found that his father, the warden of the Taiyuan Hospital, was missing in the palace. In order to find out the truth, Zhan Zhanqing risked his own life and entered the palace. But a shocking secret was discovered.
It turns out that the second prince who came to power through a bloody coup has passed away. In order to stabilize the power, the powerful ministers and the empress dowager blocked the news and asked the emperor's sister, Princess Chanruo, who looked similar to the emperor, to disguise herself as a man and pretend to be the emperor to rule the world.
The hospital guard was implicated and put under house arrest in the palace. Zhan Zhanqing was admitted to the harem in order for Princess Chanruo to give birth to an heir of royal blood as soon as possible. Zhan Zhanqing discovered that he was not the only one favored by the men in the harem. These men seemed calm on the surface, but there were intrigues and political battles in the previous dynasty. It was in this seemingly peaceful situation that unfolded.
Tracing back to the source, Zhan Zhanqing discovered that Princess Chanruo was actually the mastermind behind every struggle. Princess Chanruo relied on her own efforts to clear up the powerful officials, rectify the country, and restore the Qingming River and Mountains.