Modern crisis PR expert Shen Yu transmigrates into an ancient cannon-fodder county princess about to be sent off for a political marriage. The original owner acted recklessly, and the entire capital was waiting for her to be demoted to a commoner. After transmigrating, she decides to keep acting out, but with a method to her madness. Because the system tells her that she can only survive if the current regent, Lu Yan, falls in love with her. The problem is that Lu Yan is cold and iron-fisted, and despises capricious women the most. To make matters worse, every time she causes trouble, she manages to land precisely on the clues of the case he is currently investigating. Amidst layers of mysterious cases, she outsmarts corrupt officials, defies imperial authority, and wins renown for both her past and future.