The powerful Dayong Dynasty defeated the neighboring country Beishuo, and Murong Ke, the crown prince of Beishuo, was forced to take the Dayong Palace as a hostage. Everyone else laughed at the hostage for being docile and cowardly, allowing others to bully him. Only An Lingyue, the eldest princess's companion, knew it well - she was the emperor's exclusive secret agent, and her duty was to monitor Murong Ke's every move day and night. An Lingyue appears gentle and well-behaved, pretending to be an unintentional boudoir girl, secretly exploring information; Murong Ke pretends to be humble and respectful, secretly contacting Beishuo's old troops, plotting to overthrow Dayong and save the war-torn people of Beishuo. The two of them were in the deep palace together, making excuses and making mistakes every day, testing each other and trying to undermine each other. The longer they get along, the more Anlingyue discovers that the imperial families are secretly colluding and stirring up trouble. The truth behind the war between the two countries decades ago is also full of doubts. Her belief in loyalty to the emperor began to waver, and she also had strange thoughts about the proton who was always following him. Murong Ke was also in a dilemma between his family's great cause and his heart. The undercurrent in the court is raging, the border war is about to ignite, and the disguise is torn apart layer by layer. When the former supervisors and the monitored are at the forefront of the storm, will they stick to their positions and fight each other, or will they work together to uncover a shocking conspiracy that has been buried for many years? When the main plot comes to an end, the ultimate black hand quietly appears in the darkness, and the crisis is far from over.
