One early summer evening, Qian Yuxuan, a second-year high school student in the Department of Ancient Studies at South China No. 1 Middle School, was working late at night in front of the computer to prepare for the preliminary examination of the Department of Ancient Studies. But because she recited the name of an emperor she noticed on the Internet, the crystal cross on her chest shone brightly, and her soul traveled across time and space by mistake, and came to the "Apocalypse Dynasty" and became one of the four major families of the "Apocalypse Dynasty", the Nangong family, Nangong Xuanyuan Her fourth granddaughter was later accidentally married into the palace and became the so-called "Queen Jing Chengxian". After experiencing all kinds of ups and downs with "Emperor Ninghu" Situ Chengjing, she discovered that this time travel was just for an agreement between her and him in her previous life...