I think she's MC's grandmother and maybe Mc's mother used to be with Mc's father and they had her out of wedlock
So just because of that she wants to make the girl's life miserable???
This is only a possibility but all similar manhwa's I read like this one are like that lol
Father's wife...her mom was a mistress didn't know dad was married...dad's wife slapped while she was in school in front of her friends bc she's illegitimate
can someone explain why the old lady hates her? I get the deal with the ex and his mum but not that old hag.