The top female assassin Shen Ning (codenamed "Cold Blade") was accidentally involved in a political conspiracy during her last mission. In order to survive, she was forced to enter the palace draft to replace a young lady from an aristocratic family who died of illness. I originally wanted to make a decoration in the palace that was called "cold" but actually "transparent", but because of my outstanding temperament (too murderous), I was targeted by a jealous noble concubine. Shen Ning used the assassin's professional skills (stealth, lip reading, intelligence collection) to establish an anonymous information transmission network called "Wanshiwu" (ancient version of the chat group) in the harem, coordinating the communication between disgraced concubines. And the emperor Li Zai here, who is rumored to be decisive and decisive, turned out to be a clever emperor and a joker in private. He mistook Shen Ning's aloofness for "love that is hard to express". From then on, he started the hilarious palace life of "she runs away from him, she wants to draw a sword and he wants to arrange flowers". In the end, after Shen Ning elegantly eliminated all the villains, she discovered that the ridiculous emperor had actually seen through everything, and the two of them joined forces to clear the court and take control of the country.