I knew it somewhere from the track starting

I knew that Rohan and Karan will be revealed as Sudha's son after marriage..it happens in every single TV shows these days..I think due to shortage of story the writers vring this triesamdt tested track..but I don't know one thing...why every time the girls who get married for revenge dontd act smart..I mean why they have to cry for being get married wrongly..they can play oversmart and tell the boy and his family that it's ok that they fooled her but now she will make their life hrll and something like this..but India TV shows will ebre be able to move out from the same kind of girl Rona Dhona and love hate track and then everybody knows..