Rehnaa Hai Terre Dil Mein (English: I want to stay in your heart) is a 2001 Indian film directed by Gautham Menon starring Madhavan, Diya Mirza in the lead roles & Saif Ali Khan in the supporting role. It was a remake of the popular Tamil film Minnale which also starred Madhavan in the lead. The film was unsuccessful during the time of its release, but over the years it has developed some sort of a cult following among Indian youth. It is famous by its acronym RHTDM.
A tale of immensely passionate loveĀ : Cupid's arrow strikes Madhav Shastri (R. Madhavan) aka "Maddy" the first time he sees the beautiful and cherubic Reena Malhotra (Diya Mirza). He meets her again, and finds out that she is betrothed to one "Rajiv". Having fallen head over heels in love with Reena, Madhav decides that the only chance he has of winning over his one true love is by impersonating Rajiv. Their meetings turn into a life-altering whirlwind romance, and within the first few meetings, they both fall in love with each other. Just when their love reaches its peak and Madhav decides he must come clean to Reena so as to be able to build an honest future with her, the American-settled Rajiv Samra (Saif Ali Khan),
(This is information generated from a Wikipedia article, licensed under the GNU Free Documentation License.)