The film is a remake of Yasapalitha Nanayakkara's yesteryear movie Thushara in 1973.
[1] It stars Saliya Sathyajith and Shalika Edirisinghe in lead roles along with Buddhika Rambukwella and Piumi Purasinghe.
So Sonia and specially her father does things to put apart Thushara and Sampath.
One is to tell fake things to Thushara's father about Sampath and make him disappointed.
The story goes on as Sampath persists those challenges and finally marries Thushara and at the end of the film we get the feeling that Sonia and Keerthi find love between them too.