A modern heir to a family of traditional Chinese physicians transmigrates into an alternate dynasty as the legitimate daughter of a military family who was switched at birth. She is bound to the Benevolent Healer System, only to have her golden finger stolen by a reborn rival. To save herself, she is forced to take her twin sister's place in the palace and treat the tyrant. Using her genuine medical skills, she fights her way to the top of the Imperial Medical Academy, only to discover that the tyrant has been poisoned with a strange toxin connected to her death in her previous life.