Palangal(1981)

Usha (Zarina Wahab) comes to her sister's house for relief from a terrible tragedy of her life which is the accidental death of her lover Ravi played by Shankar. In the new place, she meets Ramankutty, played by Nedumudi Venu, who is the friend of Vasu Menon (Bharath Gopi), husband of her sister. Their friendship eventually turns into love, but Ramankutty's mother does not allow this proposal. Usha slowly realizes that Vasu Menon's feelings for her are wayward, but she does not tell her sister as she fears that this will ruin their family. So Usha decides to go back to her home, on the way she meets Ramankutty, who has convinced his mother about marrying Usha.