This is a girl's mission and history of blood and tears:
It was just that the master was worried about his young apprentice, which made the mysterious Ling return to campus from her semi-seclusion in the mountains, and disguised herself to protect her young nephew, and even pretended to be protected by her young nephew.
Just to avenge her master, she practiced magic skills regardless of the consequences, and turned into a bloodthirsty Shura that only happened once in a hundred years in the world. She had blood on her hands and killed countless people, causing the most serious disaster in the world in a hundred years.
It was all just that, hence the current story.
Conception: