Unnidathil Ennai Koduthen is a 1998 Indian Tamil-language romantic drama film written and directed by Vikraman.
The film stars Karthik and Roja, with Ajith Kumar in a guest appearance, alongside Ramesh Khanna, Moulee, Sathyapriya, Fathima Babu, and Madhan Bob in supporting roles.
Karthik's 100th film, Unnidathil Ennai Koduthen was released on 15 August 1998 and became a huge commercial success, running for over 250 days at the box office.
The story revolves around Selvam (Karthik) and his friend Bhaskar, petty thieves who are assigned to steal a Ganesh Idol. They hide in a house where they meet Radha (Roja), who is forced to live as a maidservant due to her illegitimate status. Despite being thrown out of the house, Selvam makes sacrifices to help Radha become a famous singer, leading to a complicated love triangle between Radha, Sanjay (Ajith Kumar), and Selvam.