Ning Yu, a female doctor of medicine, was murdered by criminals because of her research on "life factor", but she accidentally traveled through time. Just because her appearance was similar to the late princess, she was brought back to the palace by the regent Xiao Zhi. She accidentally discovered the truth about the death of the princess, and teamed up with the regent to find the real murderer. Who knows that the murderer of Ning Yu in modern times has also traveled through time together. Who is he, and why do we need to pursue him so closely? Was the late princess also a time traveler? Is she who she is? Did he always know it was her? The real reason why the killer hunted her for three lives turned out to be because of her...
