Speaking of Karan, there are more shocks in store for him aside from just Suman.
He's back home, and after a shower & everything, he'll want to wear a fresh set of clothes. But guess what - after his 'death', all his clothes were either donated or burnt, like Suman's saris, and he can't wear Kartik's stuff - at least, the pants would have to be folded pretty high. So being in that home, even though it's his, would be like being in a hotel where nothing is his.
So aside from reeling from the shock of losing Suman, he'll also have to shop for a new wardrobe, and who knows that else. Maybe he should also get a job (was he still a student last before he was gone, or did he start working?) If I were him, I'd start by looking for a new job, settle into a new apartment and then determine if I wanted a new wife.
So looks like Karan has his hands full for the near future