Ok, I think I said it before in other manga but... It's a bad idea to use only a single chapter to tell the betrayal in a revenge story. In this case, we aren't even told why all that scheme was necessary, and it's too short for us to hate the villains, here we barely see them, unless they make something really serious and shocking (like burning their own child (Monster Duchess)). And most of the mangas of this genre do that. I've only seen A Villainess Lives Twice using more chapters to tell it, and the pace was excellent, you knew exactly what happened.