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Movies like Trikon Ka Chauta Kon (1986)

Manisha is in a live in relationship with a married man Prakash. However, she does not want to break Prakash's marriage with Anuradha. Anuradha also finds her marriage unhappy. Prakash wants both, his marriage and relationship with Manisha. The fourth angle of this triangle is the tussle between tradition and free will, which stops individuals to do what they actually want.