Xie Mingtang was originally an orphan of an imperial merchant in Yangzhou. After his house was ransacked overnight, his brother was imprisoned and the old case became a mystery. In order to save her brother and overturn the case, she pretended to be her brother and took the imperial examination in Beijing. She disguised herself as a man and entered the court. From the old files of the Hanlin Academy to the Lianghuai salt tax account books, she hides her edge at every step, but she repeatedly encounters the temptations of the regent Xiao Zhi. One wants to find out the truth, and the other both doubts her and protects her. As the storm in the court gradually rose, Xie Mingtang realized that she wanted to save not only the Xie family, but also the crumbling country.