A 27-year-old cold, calculating assassin from the 21st century. She is deadly, intelligent, but yearns for a more peaceful life. After being betrayed, she transmigrates into the fragile body of Lin Yue, a neglected concubine in the ancient Hanzhou Empire. A young, powerful emperor with a ruthless streak. Deeply distrusting of women due to palace politics, he finds himself drawn to Lin Yue's unusual resilience and wit.