Nancy traveled to the Harry Potter world and became the daughter of Nico Flamel, who did not exist in the first place.
When he entered the school, he was bound to the system and given the attribute of "Dementor".
System: It's different, host, you are a pirated dementor, only absorbing sadness.
As a result, Nancy, whose special identity attracted much attention, inherited her father's alchemy skills while turning into a humanoid self-propelled love potion in the castle, and was unknowingly approached by people from all walks of life.
Harry: Fighting monsters with Voldemort is so tiring. It's better to hang out with Nancy.
Hermione: Schoolwork is so heavy, Nancy, can you give me a kiss?
Draco: Damn it... Why are you so happy to be near her?
Severus: I don't know why, but the quality of the potions when she was in the cellar was ridiculously high.
Tom Riddle (diary version): Being close to her is like being purified. Am I not the villain boss?
…
Nancy: Well, I am also a savior in another sense.
Hogwarts is shrouded in darkness and the shadow of war. I hope she can bring some comfort.
Purpose: To restore irreversible and save bad moods