The heroine is kind-hearted and slightly retarded, but she is easily hurt. She always feels that her best friend is better than her.
The male protagonist is a white fox demon. He is evil, sinister and affectionate.
Lin Xiaoyu is an ordinary college student and also Chengyou. She and Xiao Ao went to the same university as they wished, and they both fell in love with Gu Yifeng. Gu Yifeng went to the human world to eradicate the ghost king, but he discovered the scent of the soul of Chengyou, his lover from a hundred years ago, and went to look for her. However, Gu Yifeng ended up with Xiao Ao by mistake, and Lin Xiaoyu could only bless them. When Gu Yifeng found out that the person he was with was not his You'er but Xiao Yu, so he abandoned Xiao Ao to be with Xiao Yu. Xiao Ao was heartbroken and accidentally let the ghost king's men erode her soul and control her...