I guess sahil is in danger from abhir. Because Abhir knows that sahil has
an eye on abhir, and also now sahil and abhir are working together on a
new multi billion project given by karan sahil will have to face some litigations in future. Because sahil will try to get proof against abhir, and in this process, abhir will naturally come to know from his helpers and try to push sahil into a big trap by which all viranis will hate him.
I think abhir will do some big gafla and if karan or anyone finds out that then abhir will put that blame on sahil by showing some wrong proof and by which again sahil and karan's friendship will be shaken.
Or if lucky, karan will trust sahil or karan is having doubt on abhir by the way he was showing expressions to abhir.
lets see how it goes.