A modern surgeon accidentally falls into the water and transmigrates into the body of Nangong Linghua, a concubine-born daughter of the prime minister's household in the Great Shang Dynasty.
The original owner refused to accept her fate of being married off to bring good fortune to the eight-year-old crown prince. In despair, she threw herself into a lake, making way for her arrival.
An imperial decree gives her three days.
If the crown prince does not wake, she must enter the Eastern Palace to bring him good fortune through marriage. If he dies, all one hundred-plus members of the Nangong household will be buried with him.
With nowhere to run and certain death for defying the decree, Nangong Linghua stakes her life and volunteers to enter the palace to treat him.
Everyone believes the crown prince is simply suffering from a lingering cold, but only she sees that his mother's death has left him with a deep psychological wound.
The inner palace is a maze of deadly traps, with one poisoning attempt after another, while the emperor's suspicions hang over her like a thorn in her side.
At a moment of crisis, Prince Yan, Huangfu Linyan, a powerful ruler who has fought on the battlefield, takes notice of this extraordinary concubine-born girl.
She has never sought wealth or the empress's throne. All she wants is freedom and a peaceful life.
But when every crisis has passed, that high and mighty Prince Yan wants nothing more than to bring her back to his manor and give her a lifetime of safety and care.
