Kadhalar Dhinam (transl. Valentine's Day) is a 1999 Indian Tamil-language romance film written and directed by Kathir. It is based on a love relationship which begins through an internet chatroom and takes a turn after the protagonist has second thoughts about the relationship after finding out his lover's true identity. The film stars newcomer Kunal and Sonali Bendre (her Tamil debut), 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 film was released on 9 July 1999, while a partially reshot dubbed Hindi version, Dil Hi Dil Mein was released on 21 April 2000. The film received positive reviews and was a commercial success. The film was also dubbed in Telugu as Premikula Roju.