I have a new imagination sparkling in my mind since yesterday.
I think that this will be like Kuch Kuch Hota Hai. Nupur will die or separate from Anurag for some reason, but by that time, Taani's marriage will have been decided to somebody else. But unlike Kuch Kuch Hota Hai, the story will take the Devdas twist and Taani will marry some "Basu" (as we know from first episode her surname is Basu) and go away somewhere far. She will do this for her mother or some other "majboori" but she will love Onu and only Onu.
This will leave Anurag all alone and he will get mad ultimately and land up in asylum. After some years, Taani comes to know about this and will visit Anurag in jail.
For all those who are going to say something on the lines of "NOT POSSIBLE BECAUSE TAANI CAN'T MARRY ANYONE ELSE, SHE IS ONLY ONU'S WIFE etc. etc." think twice...its Ekta Kapoor....its not going to move ahead without some six-seven heartbreaks and ten-twelve marriages of the leads...
and oh yeah, maybe he's writing MISHTI MISHTI on the walls because he only remembers his childhood after going mentally insane😆