"...
It is the story of two families related by blood and yet distanced by circumstances. ...
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It is also the story of Zoya,...and eventually ends up bringing together the two warring families.
-----1. A lot of squabbles ensue, especially between Ayaan and Zoya… and neither realize when they end up falling in love.
.2...Asad is engaged to a very traditional conservative girl. Asad though not quite in love with her, respects her immensely for her devout ways and is beginning to see a life with her.
3. ...Ayaan's temporary marriage to Zoya gets dissolved and Zoya finds out that Ayaan was responsible for it.
And here, Asad finds out that his pious to be bride is a complete liar and was taking him for a ride all along.
.4. ...…. with Ayaan wanting to win back Zoya with whom he has totally fallen in love with and Asad vowing to never ever love again.
5. Ayaan realizes that the only way he can win back Zoya is with the help of Asad. But Asad hates women and more so women like Zoya. So what will unfold now between the two brothers and Zoya?"
From what I gather, Uhsud will realize the duplicity of his fiancee (likely the new entry) before marriage, whereas Uhyaan and Zoya will marry and then divorce/annul it.
The only confusion is regarding point number 1. There has hardly been any interaction between Uhyaan and Zoya for them to fall in love. Perhaps it is a typo and the name is meant to be Uhsud, not Uhyaan.
Link for those who want to read the complete story:
http://www.zeetv.com/shows/qubool-hai/
Jayne