1. I saw someone comment that they were confused by the story SO, I shall try to explain as best as I can. Here goes: Yu Hetian is an orphan, she lived in an orphanage until about 5 years old, during that time she could see a ghost at the orphanage (though she didn't know it was a ghost). Also, during her time at the orphanage, she met Yao Hei, who taught her one-on-one combat in secret. Then, at about five years old, she was adopted by Father William, an exorcist who fought demons. He had found her, injured, in the woods and taken her to the hospital. Yao was the one who injured her in the
