Zheng Lingjun, a first-year medical student, jumped into Yunmeng Lake to save others. Once he traveled through time, he woke up in an unknown dynasty and became Princess Zheng. A plum blossom mark appeared inexplicably on his forehead, which made Zheng Lingjun disliked by his father and became an unloved princess.
Three years later, Lingjun was named Princess Lechang and was forced to go to Wei to get married. While the marriage team was walking, they were chased by a killer. Lingjun and Gu Yuan fled all the way to Luoxia Mountain, and they gradually fell in love with each other during their escape. The killer chased them all the way, and Ling Jun and Gu Yuan were forced to jump off a cliff.
Unexpectedly, there was a clear spring under the ten thousand-foot cliff. When she woke up, Lingjun found herself back in the Zheng Palace, back to three years ago, when she had just traveled through time and became a princess. Now that everything has returned to three years ago, Lingjun thinks that he should be more accomplished and learn to use his own advantages to find a bright future for himself and create a peaceful and prosperous age for the people.