The world is divided into Jiangnan and Snow Country. There are two types of magic in this world, illusion and occult. Miss Jinghong, the killer who brought down the country sixteen years ago, picked up three-year-old Xiaoxiao in Mengmeng River. Sixteen years later, when Xiaoxiao was on a mission as the third killer in Jiangnan, she discovered that her previous life was actually her biggest enemy, Mr. Fang, the number one killer in Jiangnan and the woman she loved most. And the woman who captivated the country turned out to be from the hostile Snow Country.