Achha Bura 1983 on netflix

Shekhar and Birsingh are bosom pals. They come to stay at a small chawl where an angry woman confronts them. But when their hatred turns into love and oneness they form a sister-brother relationship, willing to lay down their lives for each other. On the other side, there are two lovers – Ravi and Rita. Shekhar and Birsingh are also strangely related to Rita.