Su Yu, a college student in the 21st century, got into a car accident while rescuing others. He time-traveled into the body of Baili Su Yu, the eldest princess of the Wei Dynasty. The queen of the Wei Dynasty was in power. The eldest princess wanted to imitate the queen and become emperor, but the prince was watching. Su Yu originally thought she could live a life of eating and waiting to die, but found that she could only gain control of the eldest princess's body at night. The eldest princess got married at the age of 16, but her consort suddenly died of illness three years later. The eldest princess suffered the pain of losing her husband and was depressed. At a banquet, she met Liancheng Xiang, who was well-known in the capital. She fell in love with him at first sight, so she made every possible effort to embarrass him, framed him, and finally designed to bring him into the princess's mansion, where he became the face of the eldest princess. Su Yu wanted to help Liancheng Qiang leave the house and embark on an official career, but he could only control this body at night. Gradually, the eldest princess became aware of Su Yu's existence. Su Yu simply made a concerted effort to send Liancheng Jinyu out of the palace to become a third-rank official at the cost of completely exposing himself. He also reached an agreement with the queen to dissipate most of the family wealth and promised not to covet the throne anymore in order to protect his own safety. The eldest princess knew that Su Yu had done all this secretly, so she asked a Taoist priest to expel Su Yu's soul. Unexpectedly, the Taoist priest said that all of this was due to chance, so it was better to let nature take its course. The eldest princess couldn't accept that she was going to die together, so she locked herself in the room and set a fire, but was rescued at the critical moment. After Su Yu was rescued, she found that she had gained full control of her body as a blessing in disguise. At this time, the young Minister of Etiquette Liancheng Jinyu asked for a marriage, and the other party turned out to be the eldest princess whose reputation had been ruined...