Parallel- a person or thing that is similar or analogous to another. Source Google.
When I first started watching this show, it was introduced as a parallel couple show. Sadly within few episodes I realized that its hard to understand the concept of parallel. We have started classifying MisBir as the leads and KuKu as the second pair on the show. Lets all respect the fact that this show is made up of two lead pairs and the rest of cast and not be so negative if there was a scene of the other pair.