Here is the idea I have:
1. Ranbir reveal the deal he and rhea made to prachi to make prachi hate him.
2. Prachi starts to hate ranbir.
3. Ranbir and rhea marriage arranged, and prachi pretends to be happy but she decides to teach them both a lesson.
4. Prachi takes rhea place in mandap and puts the entire blame on ranbir in front of the family saying he has planned all this as he did not want to marry rhea and that his family were forcing him to marry rhea. Ranbir's family and especially abhi become against ranbir but also abhi misunderstands prachi too that they both deceived rhea. So daddy gets another excuse to play bias between daughters.
5. After pranbir marriage rhea starts plotting again pranbir more than ever, whilst prachi taunts ranbir and makes everyone against him too.
This way we will get pranbir marriage, we will get an angst-filled story of pranbir where ranbir will have to prove his love, and rhea will get good karma.
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