When Shen Qingci, a graduate student in the Department of Modern History, traveled through time in a museum accident, she became the abandoned son and concubine of the household minister of the Yong Dynasty. She was used as a scapegoat and sent to the deep palace as a hostage.
Step by step in the palace, she was shocked. She relied on her knowledge reserves from the history department, common sense of chemistry, and calm mind to survive in the midst of the difficulties faced by her eldest sister and the secrets of the harem. Unexpectedly, an accidental eavesdropping in the imperial garden led her to meet the cold-faced, taciturn and powerful seventh prince Xiao Che - the rumored "evil ghost" who had killed enemies at the border for ten years and had old scars on his wrists.
He suspected that she was scheming, and she guarded against his probing at every step. The compass weaved from blades of grass was the flaw in her secrets and the beginning of his curiosity; her agility in spotting poisons at the palace banquet made him fearful but couldn't help but get closer; during the war at the border, her strange instruction to "disinfect the wound" turned out to be a weakness hidden under his armor.
One is fighting for self-preservation, while the other is hiding his edge for revenge. From the mutual use of intelligence transactions, to the clumsy concern of the beacon letter; from his words "she is mine" during the confrontation in the main hall, to the logic diagram she drew when they joined forces to break the situation... In the whirlpool of power and intrigue, two lonely hearts gradually got closer and became each other's only salvation.
When the prince's conspiracy was revealed and the dust-laden truth came to light, he became the powerful regent, but he was willing to leave the backyard for her and welcome her as his wife with an eight-carriage sedan. He taught her to understand the affairs of the court, and she took him to taste the fireworks of the world.
