Here is the gist ---
There had been many family dramas like Hum Log and Buniyaad with some romance in it, but they don't belong to the category of "just romance and romance" so the actors and characters from such serials are not considered how so ever popular they may be. For that matter there was romance in Ramanand Sagar's Ramayana too ...
The first serial which comes to mind is "Trishna" based on Jane Austin's "Pride and Prejudice".
The actor who played Mr. Darcy's role -- one Tarun Dhanarajgir became very popular -- those days there used to be only Doordarshan and Tarun Dharajgir became a heat throb of the nation -- specially all the girls and women. Among the other casts , there was Kitu Kidwani who was one of the younger sisters of Rekha (Elizabeth) and we all know that she really ruled the tv screen with getting roles like Svetalana in Shobha De's "Swabhiman" .
I think "Trishna" is available on youtube, try to download and see how Tarun Dhanrajgir portrayed the role of Mr. Darcy.
The next serial is "Kashish" again on DD. It was fully based on one M&B novel , with some Indian elements thrown in. It starred Sudesh Berry and Malvika Tiwary. Both the actors became very popular and they tried to cash in on the popularity by joining Bollywood too...
Then the next one is of course "Kahin to Hoga " ... Most of the people on this forum might have watched it too , I never watched it but had read about its popularity.
I am sure all of us will remember IPK for a long time and may not fall for any other serial in future as we will always compare it to IPK ...
What do you feel guys?