Forgor the title

Fl is hired as a nanny for ml’s son who’s the child of fl’s childhood friend, fl has blonde curly hair n I think she’s like the head mage of the mage tower n she has like 3 disciples. The ml’s family has a curse that like makes him go crazy or something so he try not to be close to his son to not hurt him n fl’s studying the curse to break it and gives him a ring that controls his power. The fl lived in modern time too but she got hit by a car n is in coma n the fl in the story uses the coma fl’s life energy n she cough out blood every time. Any one knows this story lol