Moondru Mudichu

Moondru Mudichu English The Three Knots is a 1976 Tamil film that was directed by K. Balachander. The movie stars Kamal Hassan, Rajinikanth and Sridevi in major roles. The movie revolves around three people, a college going girl Sridevi and two men who fall in love with her Hassan and Rajinikanth. The film was based on 1974 Telugu film O Seeta Katha directed by K. Viswanath starring Roja Ramani and Chandramohan.

Prasath Rajinikanth and Balaji Kamal Hassan are roommates in a city. Balaji falls in love with Selvi Sridevi who lives in the same apartment complex. Prasath, who has his eyes on Selvi, pretends to back Balajis love while secretly hoping to create a divide between them. Selvi realizes Prasaths evil intentions when she finds out that he has seduced an innocent girl living in the same apartment complex. However, she is unable to convince Balaji, who heroworships Prasath.Things come to a head when Balaji and Selvi go for a picnic by the lake and Balaji decides to invite Prasath along. As the three of them head to the middle of the lake on a boat, Balaji topples over by mistake. Prasath refuses to jump in and save Balaji, on the pretext that he does not know swimming. A devastated Selvi returns home to another shock her sister Y. Vijaya, who plays small roles in movies, has been in a fire accident which has left her face permanently scarred. Overnight, Selvis life undergoes a drastic change. ........

Source: Wikipedia