This is what gives me hope for the serial. If TVS was to be a full-on negative guy, surely there would be no bother with conscience? Varun is a good enough actor to do a purely evil role I believe, so if these nuances are there, we can only hope that he is a grey character, or a positive character with a less than stellar past.
And yes, no one should come between these two, if Sugni hates TVS when the truth of Reva manzil comes out, that's fine, but it should be thrashed out between the two of them, NO Adi in between.