It is said that Princess Li Yunzhen (Qi Xiaxia) is arrogant, extravagant, corrupt and self-serving, which makes people despise her. Guard Gu Xuanqing (Jin Chao) is sent undercover to collect evidence to bring her to justice. Against the backdrop of political disputes, the princess's unspeakable secrets gradually surfaced along with the truth of the corruption case, and guard Gu Xuanqing also fell in love with the target during the undercover mission.