1. HP magic world + Eastern cultivation dual world view setting; Severus Snape × original heroine
2. The heroine is a demon cultivator from the East (actually from Greater China). She has a rough personality, but she follows an orthodox immortal cultivation method and has little to do with monsters.
3. It's not a book. The heroine doesn't know the development of the plot, but uses Harry's first grade as the time dividing line and knows the general situation of Snape's past.
4. Plot: It's actually an office romance between a female elf who comes to Hogwarts to teach an introduction to Eastern magic (mistake) and a local Potions professor at Hogwarts (dense fog)
5. Don't discredit all parties, do whatever you want; but since I am a fan of professors, I may use fan filters without knowing it.