She is the head of the "Yi" family. In order to find her sister, she joined the "Blood Shen", a killer organization that is not tolerated by the world. She is the best intelligence agent in the "Blood Shen", but in the end she and her sister are at odds with each other. He is the ever-changing head of the "Blood Shen". Who does his heart belong to? The heart belongs to nothing. He is a fox demon who has practiced for three generations. It is destined that he will give up his practice...