Comments of chapter undefined of The Heroines Will Only Be Happy... Once I'm Dead

the only thing that I don't like in this story is that prince and cor? (fiancee of prince.) honestly mc should have changed that.. if she is with that prince and let him treat her like sht just like in past no hell if she is in relationship with that prince. then I'm dropping this story.. so author san can you please give me a clear spoiler...