Don't beat me up for making theory guys.
My "atrangi dimag" is making theories to tolerate RiAnsh MU (rangu ka asar hai)
Kash Aisa hota ke , Vansh has some serious illness & Ahana is just his doctor. Vansh is doing all this intentionally to hurt Ridhu so that she hates him & moves on.
I know , bohot typical ITV ho gaya na? Sorry.
