Harry Potter: the Prophecy of the Hexagram

Lan Yao and Bai Ying, two friends who have been together since kindergarten, go to and from school together (note: they are neighbors), skip classes together, challenge the teacher's authority together, and are punished together... The two have always been close friends since childhood, and have never been separated since they met (again, note: the two take turns to live in each other's house, and they live very close to each other anyway.) And now, they received a letter at the same time. The envelope was made of heavy parchment, the address was written in emerald ink, and there was no stamp on it. On the back of the envelope there was a wax seal, a shield, and a capital "H" surrounded by a lion, an eagle, a badger, and a snake. The letter was quite thick to hold. "I think it's a prank, what do you think, Ying?" "Whatever, let's make a deal after we go." … "Why are novels and reality intertwined?" … "Why!! Why would I go to Slytherin!!!" "Why do we need to separate?!!" … "If you are willing to be my dance partner, then never exchange." "..." …