Now that I think about it Vihaan and Rachna might just end up together.Vihaan's redemption track is Rachna's forgiveness, its guaranteed drama. The two other leads leads are goody two shoes Mayank and Rajeev but V the bad boy he just presents a new dynamic .Gunjan is almost guaranteed to end up with Mayank and yeah! Vihaan will change for his brother's sake in the future.
quite possible rachna may forgive vihan eventually but in between them, may be rachna would come to know about feelings of Rajeev and Rajeev also would have to face some situations when he cannot hide his feelings for Rachna more.
vihan may def change himself for Rajeev but it is not necessary that Rachna would ready to accept him. now she will stand up for her self respect.