Shen Yuan, a noblewoman from the capital, is known to the world as a gentle and virtuous woman who is the perfect puppet to sacrifice for her family. No one knows that every night, she will transform into a black-masked wandering doctor, taking the pulse of the hidden illnesses of high-ranking officials and consulting on her own destiny. Until the hospital welcomed the most mysterious guest - the cold-faced imperial uncle who was engaged to her sister "Bai Yueguang". He held the portrait and looked at her with a meaningful look: "You look very much like the same person."
