The main characters are Michael and Lucifer, and they were written with reference to many books (most of them are that kind of information), such as the Bible, Paradise Lost, and the like. In order to write this type of novel, I once went to a church (the kind of small church) and bought a lot of Western fantasy series books, such as The Encyclopedia of Angels, Alchemy Decrypted, and the like. . . In short, I have been studying very hard for four or five years in order to write this kind of Western fantasy novel. . .