Plot-
This is a story of 2sisters and a photographer.
He was in love with the elder sis , but she used to dislike him. She got married . Meanwhile the younger sis came close with the photographer. He used to think her as a baby girl as she was perky, chirpy , happy girl. But the Younger sis always had a thing for him. To her it was love. Then one day the elder sis lost her husband. She came back home. Like past she started to create drama . Everyone got busy with her, including the photographer. No one noticed what is happening with the younger sis. One day the younger sis came to know that the photographer is still in love with the elder sis and he proposed and she accepted. Seeing this she got her heart broken. Next morning they find the dead body of the younger sis at the pool.
Silsila is also showing the same story. Even the season 1 was based on another bengali novel "vishvriksha". This one is also doing the same. Just in that novel the younger sis was most probably 12+ and in here 19/20. But same photographer and same two sisters. Most probably in that novel also he was a PG at their home.