Su Jiu Er is a young, talented, and personable female constable with a keen investigatory mind. She hails from the Qian Kingdom, meaning she is in possession of a rabbit-like spirit – and that she constantly feels cold. She is attracted to warmth, wherever she can find it. During the course of her investigations, she is forced to go undercover, where she meets Han Zheng, a member of the Qi Kingdom's ruling family.
Han Zheng is imbued with a wolf-like spirit, which grants him phenomenal strength and agility. It also makes his skin incredibly warm to the touch – a factor that makes Su Jiu Er want to cuddle up to him! But he lacks interpersonal skills, and is harsh and abrasive to everyone he meets. Opposites attract, however - and this unusual duo forms an increasingly close bond as they investigate a strange murder case that involves both of their kingdoms. Will their hot-cold connection lead to love?