Anupama Kaul (played by Bipasha Basu) is a woman whose sister lives in New York. One day she gets a call from her sister and while they are talking on the phone, her sister is killed by the 9/11 attacks. Anupama is devastated.
A few years later Anu is happily engaged to Arpit Oberoi (played by Priyanshu Chatterjee); then Arpit leaves for America for business reasons and Anu is wooed by a man named Aman (played by John Abraham). When Arpit comes back from America, Anu tells him that she is in love with Aman and she can't marry Arpit. Then Arpit starts asking questions.
Who is Aman? Where does he live? She can answer these questions but there's no evidence to support her answers, which leads Arpit to ask "Does he even exist?"