Kadhalar Dhinam (English: Valentine's Day) is a 1999 Tamil romantic film directed by Kathir. This film 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. Ratnam, had music composed by A. R. Rahman and cinematography by P. C. Sriram. The film was released in July 1999 and became a huge commercial success.