An accident allows modern emergency doctor Bai Xue to travel back to the Tang Dynasty in the third year of Zhenguan. When she first arrived in Chang'an, she relied on her modern medical knowledge to save a child who was in a coma due to high fever and was on the verge of life and death, and she became famous. However, in strange times and complex interpersonal relationships, crises are hidden everywhere.
Bai Xue settled in Pei Mansion and met the mysterious Pei Yan. As a Jinwu Guard, Pei Yan also bears the secret responsibility of being the leader of the secret guards. From the first time he met Bai Xue, he was attracted by her courage and determination, and unknowingly, he silently protected her. As they get along better, the two work together to deal with difficult illnesses and solve palace mysteries, and their hearts get closer and closer.
The palace situation is treacherous, the prince suddenly contracted a serious illness, and Bai Xue diagnosed it as deliberate poisoning. With her superb medical skills, she saved the prince by administering acupuncture and medicine, but she also got involved in the power vortex of the court. The three princes behind the scenes colluded with Jianghu forces in an attempt to usurp the throne, and pointed the finger at Bai Xue and Pei Yan. Faced with the pressing steps of the third prince, assassinations and conspiracies followed one after another, Bai Xue and Pei Yan supported each other and never gave up.
In this troubled world, Bai Xue uses modern medical wisdom to peel off the cocoon together with Pei Yan to explore the truth. Their relationship became more intense during the test of life and death, and they persisted despite misunderstandings and dangers. At the moment of the decisive battle, the palace was in flames. Bai Xue and Pei Yan fought side by side, relying on each other for life and death, and worked together to crush the third prince's conspiracy.
In the end, the conspiracy was successfully foiled, and the third prince was brought to justice. Bai Xue and Pei Yan also received their happy ending, walking hand in hand on the Chang'an city wall, writing a legendary love that spans time and space, and has become a good story that has been praised in Chang'an for thousands of years.