On a snowy night in Chang'an, Shen Jinghong, the daughter of the guilty minister, is dormant as a medical girl, hiding the family's injustice and the secrets of poisonous techniques. Xiao Che, the king of Jing'an, has gained power and secretly controls the secret agent organization "Dark Lin Guard", which is also pursuing old cases from the previous dynasty. When a snow falls, a shocking scene emerges. The two are entangled in an unsolved case. In the maelstrom of intrigues and the treacherous world, they go from "contracted partners" who test each other to soul mates who share life and death. They explore the truth in the shadow of swords and swords, and compose a love-hate marriage legend in the wind and snow of Chang'an.
