mermaid_bride's manga / #Reincarnation(3)

Fl gets reincarnated into a villianess in a romance novel. The main couple in said book has always caused death to the supporting cast which is the other love interests, maid, rival, and oc the villianes. Fl tries to save them and plans to leave her title in a year but the harem eventually falls for her preventing her to leave and befriends the other side characters.

FL is reincarnated in her fav book as a side character. She stans the villain and he is a child of the duke. ML is the father of the villain and thinks that the gifts and interest in his adopted son are because she likes him and takes interest. FL is kinda "weak" because she cant hide her gem which is like a second heart for magic idk. She takes these pills from the church to help with her help which is kinda sus. The ML and FL are engaged and when the they ask FL's father for his blessing which he say no to. ML and FL are like ??? I think it has something to do with FL's family and that they're actually hella powerful. FL's family are light magic users while the duke's family is dark magic users. Omg the contrast it's like opposites attach so cool, never seen something like that before. Side not the son is kind of annoying, he's sweet and all but idk how much tears I can handle from him, at first it was like "aww :'(" but now it's like "aghhh :|"