After reading the spoilers I feel so bad for Cosette and would have 100% supported her revenge arc if it meant not harming inoccent people. The real villains are the grandfather and the dad I hope they get the terrible ending they deserve.
Honestly my prop with her is that the demon that has possessed her doesnt care for the revenge that Cossetes mum summoned her in the first place to do in name of her suffering and dead daughter. Therefore that thing aint even Cossette. But if it was her soul there too I seriously would understand her revenge against them just like with Anitta from Prince is trash(sorry it has many titles). They are good villains.
SPOILERS
According to the novel Cosette isn't actually Cosette - the body is Cosette, the daughter of the Duke and his first wife, but the soul is actually of a demon, similar to the blonde guy. When Cosette was born she died (or maybe was stillborn? I don't remember clearly) and the demon took her body and pretended to be her, though I don't remember if it was the Count or Cosette's mother that made the deal. That is the "Cosette" we see in the series. We've already seen that it was true Keira's grandfather made a deal to have the first wife killed, and yes, technically if it weren't for him Cosette would have been the first daughter and the princess of the dukedom instead of Keira. "Cosette" doesn't give a damn but that was the revenge that was agreed upon per contract I believe, therefore a contractual agreement to get revenge on the dukedom though I don't remember if the entire empire was included. (If you wanna see more spoilers you can look up actually, I was the real one novel spoilers, and check the novel updates spoiler thread :))
Yeah it's very unfortunate. If it weren't for the whole demon thing then I think Cosette's revenge would be justified - after all she did get her position stolen, her family stolen and her mother died. Her entire life was ruined because Keira's grandfather couldn't stand the idea of his daughter not giving birth to the girl that would have Beatrice's power, and even less her having the position of just being the 2nd wife. I can't say I personally feel guilty but realistically if it weren't for the demon and this story was read from Cosette's POV, Cosette would be totally justified in her revenge and we'd probably even be rooting for her.
Nah this is literally mpreg lmaooo this is gayer than lots of bl manhwas out there