Kadhalar Dhinam (Valentine's Day/Lovers Day), is a 1999 Indian Tamil romance film written and directed by Kathir. It is based on a relationship which begins through an internet chatroom and takes a turn after the protagonist has second thoughts about the relationship. The film featured newcomer Kunal Singh and Sonali Bendre in the lead roles, while Nassar, Manivannan, Goundamani and Chinni Jayanth appeared in supporting roles. The film produced by A.M. Rathnam, had music composed by A. R. Rahman and cinematography by P. C. Sriram. The original film was released on 9 July 1999, while a partially reshot Hindi version was released on 21 April 2000.