Zhang Huai is a wizard and a musical genius in Ravenclaw.
He is also an amateur Taoist priest.
Regulus Black was a short-lived ghost in Zhang Huai's eyes, but he was much more pleasing to the eye than his brother.
First, Zhang Huai saved him with the idea that "if he doesn't save Hui Dao, his heart will be unstable".
Secondly, fall in.
Intention: good ending