Most of the scenes with Sugni and Vik in the same frame has Sugni dancing with a big ghoonghat. So it could be that Vik is not aware its Sugni. Maybe she finds out something from Gulabiya (the Reva manzil promo) and sort of as a revenge goes to dance in his haveli because she thinks he is cheating her?
todays epi she came in blue saree n doing rai in diff costume so mayb Vik didnt realized its sugni has he cnt see her face