I think they're going to show Sanam dead and then the police will find her body.
Once Ahil sees her dead, he will either die on the spot. Together in life and death just like asad zoya.
Or they'll show him so upset that he'll drive and get in a major accident then he'll have to have plastic surgery hence new character and different personality would be justified plus he'll forget his memory.
Hmmm...plausible?