I think the best comeback song for karan after knowing about riddhima is now married will be the rock version of
"Kabhi na kabhi milogi,mujko yakeen hai" âď¸ from film Shappit . It has all the elements of a lover pain for his lover who is now distant and beyonf reach .What do you say ?
P.S -> Just hoping that cv do not make it a "Sujal-Kashish-Piyush" Type story ,i mean that tlove triangle was terrrrrificđłđł ,on of the most memorable but man dil mil gaye is more about happiness so please CV do not make the show dirtyđ¤˘