She is neither a god, nor a demon, nor a human being. She can change her destiny against the will of heaven, and her only mission is to balance the worlds of humans and demons.
She is the protagonist of this book, but not the protagonist of every story in the book. She travels to famous mountains and rivers, and she passes every monster's story; she lives in the heart of every monster she has helped; but she will eventually forget the existence of every monster.
The original work of this book is "Bo Yi Zhi" written by Zheng Huangu in the Tang Dynasty. The author adapted it and added some purely original content.