General introduction: Nan Yuanlin traveled through time and became Harry's sister Lin, and grew up in the Harry Potter world. She experienced stories of joys and sorrows. Lin's character is relatively stable and wise, but she is not an all-powerful little strongman.
Another: Since God allowed me to be reborn again and lost my parents, then, my brother, I can only protect you with my own strength, even if my wings are redundant for you...
If my father hurt you and my mother did not give you complete love, then, Sifu, I will repay you and protect you until I die.
Not surprisingly, the male protagonist is a professor.