help ( ms has a long black hair and the vampire has a blue hair

Im looking for this manhwa/manhua about this girl (mc) she was bullied at school because her mom is a shaman(?) and then mc, she has a red string connected on her finger with this vampire ( i dont remember lol ) and she been keeping the vampire inside her closet so that her mother wont see the vampire in their house..and mc was bullied by tiny girl with short hair..mc seems like have a crush on a teacher on their school(?) That's it what i can remember, please help..ik you guys are the greatest when it comes for finding title