Liu Xinyan was born in Wu Zetian's hometown. She is a beautiful policewoman and has a boyfriend Xiang Yifan who loves her wholeheartedly. Behind all the good things, two weirdos appeared, one was Xue Zhiyan, who put a ring on her but couldn't take it off. The other one is Li Jing. This man saved Liu Xinyan three times, but he wanted Liu Xinyan to be his teacher for three years and work for him for three years. He also promised to find a destined person for Liu Xinyan who could take off the ring. In modern times, Liu Xinyan found out that her beloved boyfriend had betrayed her and was taken away by her childhood sister Ye Xue. But Xue Zhiyan, whom she didn't love, pursued her. At a critical moment, Li Jing brought her to the Tang Dynasty 1,400 years ago. In the Tang Dynasty, she was forced to accept the order of her master and help Xue Rengui. On the way there, she happened to meet Liu Yinhuan, Xue Rengui's wife, who had been searching for her husband for ten years. The two looked so similar that they became sisters. Unexpectedly, her sister Liu Yinhuan met Xue Rengui and killed Liu Yinhuan. In a difficult moment, Liu Xinyan opened the tips bag given to her by Li Jing. It turned out that Li Jing had already figured out everything that happened and asked Liu Xinyan to pretend to be Liu Yinhuan, Xue Rengui's wife, and help Xue Rengui conquer the world. At this time, Xue Rengui had intended to marry Princess Zhaoyang, but Liu Xinyan tried her best to stop her. She asked Xue Rengui to observe filial piety for her sister (Liu Yinhuan) for three years before marrying someone else. Xue Rengui agreed to this condition. In the Tang Dynasty, she hoped to return to modern times every day, and then by chance, she became Xue Rengui's wife. . . . . . In the next three years, Liu Xinyan carried a pistol and made suggestions for Xue Rengui, resolving numerous crises and rescuing Tang Gaozong and Wu Zetian. She lost the opportunity to return to modern times twice. When she was about to return to modern times again, she found that she had fallen in love with the man in front of her. . . . . , And she is loved by another man who is willing to destroy everything, and when the general wants to bury 150,000 prisoners alive, will she let Xue Rengui choose who will be her wife? Or Princess Zhaoyang? Or another beauty? What orders would Wu Zetian give? Will she miss out? Will we return to modern times? Where to go? Will she finally get her wish?