"The Heroine Had An Affair With My Fiance" should be "The heroine fell in love with the fiance I wanted to break up with anyway"
You know how there's usually two types of "villainess" stories?
- One where the og heroine is actually good so the FMC aims for an happy ending for both of them.
- One where the heroine is actually a bitch, that was only portrayed in a good light in the novel, or it was a shit edgy novel, or she's a psycho transmigrator, etc... and the FMC has to reverse the story to get the heroine ruined instead of her.
Well, this story's a new one:
Through her own actions, selfishness and short-sightedness (and forced writing by the author), the FMC turns the perfectly good heroine into a villainess.
And there's no deeper meaning, like a reflexion on the FMC interferences with the story. It's played straight.