Feng Lingyue, a modern female assassin, transmigrates one day into the body of a pitiful village girl in Xinghua Village. Her parents are dead, and she and her younger brother have been driven from their home and forced to live in a cave. A mysterious space is hidden inside the phoenix birthmark on her right arm. After saving a white tiger on the brink of death, she unexpectedly awakens the power to command beasts and tames a whole host of them. Using the space’s spirit spring, she practices medicine and helps the people, earning fame far and wide. While selling medicine, she meets a seemingly frail county magistrate who is actually the head of Qilin Pavilion, beginning a remarkable romance.
Xie Yunche’s identity is exposed: he is the Seventh Prince, born to Consort Mei twenty years ago and switched at birth.
The two join forces to relieve a drought and investigate the illegal salt trade, displaying their extraordinary abilities. A dragon-shaped birthmark briefly appears on the county magistrate’s arm.
When an epidemic breaks out, the spirit spring is used to make medicine, and the shadow of a divine phoenix appears.
The Imperial Astronomical Bureau discovers that a phoenix has appeared in the world. Spies are dispatched, and the court is thrown into turmoil. The old emperor summons Feng Lingyue to the palace, ostensibly to reward her and acknowledge his son, but with murder in mind. Riding on the phoenix’s head, Feng Lingyue leads an army of tanks into the imperial city, foils the old emperor’s plot, and has her beasts retrieve the imperial seal of succession, seizing the throne outright. She establishes a merchant fleet to take control of the treasury and improves gunpowder to defeat the Xiongnu cavalry.
A coup led by the Eunuch of Nine Thousand Years is crushed by the White Tiger army.
As the layers of secrets are peeled away, Xie Yunche’s merfolk origins come to light.
After the new emperor ascends the throne, Feng Lingyue becomes both empress and the first female official. Using her space to cultivate high-yield crops and open maritime trade routes, she rises step by step to the pinnacle of life.
At last, their dragon and phoenix birthmarks join, making them legends.