In an imaginary dual time and space background of the Dajing Dynasty and the modern city, Prince Xiao Jingyuan of Dajing was assassinated by a political enemy. This coincided with the vision of a series of nine stars. He was transported to the modern society of the 21st century by thunder and lightning, and fell in the rental house of the heroine, an online novelist who lived alone. The heroine has no choice but to take in this man in ancient costume who calls himself the "Prince", and the two start a frantic life in a shared apartment. The prince gradually adapts to modern life from an ancient emperor who knows nothing about modern civilization. He becomes emotional while getting along with the heroine day and night, and finally gives up the imperial power of his homeland and chooses to stay in modern times to be with the heroine.
