Su Jiu Er is a talented young constable from the Qian Kingdom with exceptional investigative abilities and a rabbit-like spirit, making her sensitive to the cold and always searching for warmth. While working undercover, she meets Han Zheng, a member of the ruling family from the Qi Kingdom, who possesses a wolf-like spirit that gives him immense strength and warm skin. Despite Han Zheng's rough and unfriendly demeanor, Su Jiu Er is drawn to his warmth, and they form an unlikely bond as they work together to solve a murder case that involves their respective kingdoms. Will their contrasting personalities and unique bond develop into something more as their investigation progresses?