The drama tells the story of Su Jiu'er (played by Li Yitong), a female constable of the Qian country who is scared of cold, and Han Zheng (played by Bi Wenjun), the warm young master of the Qi clan, who meet because of a strange murder case concerning the relationship between the two clans and form a partnership of two people with a huge warmth difference. They work together to go through the fog and find the truth under. At the same time, they also dissolve the crisis their families are facing.