Xie Yingmian, a military doctor in the 21st century, once traveled through time and became Princess Ling, but she was in a desperate situation at the beginning. On the line between life and death, she relied on her extraordinary medical skills and courage to fight for a chance of survival for herself. During the diagnosis, she discovered that King Ling was suffering from an unusual disease, but was plotted against him and was infected with a strange poison. By chance, the key to detoxification was closely related to the mystery of her time travel. As the past and the mysteries of the present intertwined and emerged, the conspiracy in the palace was gradually revealed, and Xie Yingmian used his wisdom and medical skills to solve the problem. And the rumored cold and unfeeling Prince Ling showed trust and sincerity in each cooperation.