Chu Jiu Ling, daughter of the late emperor, uncovers a devastating truth—her uncle, the current emperor, is behind her father’s death. Driven by vengeance, she attempts to assassinate him on her wedding day, but the plan fails and she is imprisoned.

In a desperate act of loyalty, her best friend Jun Zhen Zhen sacrifices herself, and Zhen Zhen's father, Jun Ying Wen, orchestrates a daring escape by swapping their identities. Now living as Jun Jiu Ling, she finds refuge with the influential Fang family and earns a reputation as a brilliant physician.

As she digs deeper into the corruption festering within the royal court, Jiu Ling becomes entangled in a web of intrigue involving her childhood love, her late friend’s former fiancé, and a steadfast imperial guard. With the fate of the empire hanging in the balance, she must walk a dangerous path between justice and survival.