I think the marriage will happen for real. Becos the makers have no story left, if they plan to progress without getting preeta and karan's marriage.
If marriage happens possible areas to focus
1) Karan taking revenge for his brother's marriage with sheryln.
2) karan and rishabh relation will not be the same ( from rishabh's side). Or we can say change in rishabh's behaviour.
3) Since rishabh confessed his feelings to his family (mom and bua).. bua will make ma to believe preeta played with both the brothers feelings and took advantage.
4) Sherlyn and preeta face off.
5) new entry( forgot her character name) who likes karan will turn join hands with villan.
6) villan gang = prithiv + sheryln + New character)
Seasoning : romance betwèn karan and preeta making rishabh jeolous.
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