Lovers' day) is a 1999 Indian Tamil-language romance film written and directed by Kathir.

It follows a love story of two youngsters that begins through an internet chatroom and takes a turn when the hero has second thoughts after discovering his lover’s true identity.

There, poor boys are made to work from age five, either at factories or farms, so that they can support their families.

Raja heeds his mother's pleas and moves to Mumbai to attend under graduate entrance exam at Ramachandra Institute of Management Studies, the top-most premier b-school in India.

Three years ago, he reaches Mumbai, where he plans to get admitted into the prestigious Ramachandra College of management, one of the most premier institutes in the nation.

This was because Ramachandra saw Raja sleeping on the same enclave-side bench, where he had slept without having anything else than the thought of providing quality education to all, 40 years ago.

But the poor baby dies and this pushes Ramachandra to create the best institute in India, by hard work.

However, things take a turn for the bad when they are both unable to express their feelings about each other due to fated accidents.

The next day, Raja meets her in the train station and gives her his books, with the love letter inside of it.

On the other hand, Raja does not want to hurt the feelings of his beloved guide and teacher, whom he respects as his father.

Kathir, being an inveterate surfer of the cybercafes of Chennai and Bangalore, decided to make a film on what he felt the internet could develop and be used for – romance.

Since producer A. M. Rathnam was not aware of the internet, Kathir created a comedy track including Goundamani "to make it reach audiences".

[8] Shaam was amongst the auditionees for the debut lead role,[9][10] before Kunal Singh was selected after Kathir spotted him outside a Bangalore cybercafe.

The Pune-based Singh had been in Bangalore only to bulk up his body before joining the army, but with the offer chose to make a career in films.

[11] Kathir had scouted for a non-Tamil actress to play the female lead and subsequently Bollywood actress Sonali Bendre was signed on to play Kunal's lover in the film, making her major debut in Tamil films.

Isha Koppikar had also been considered for the film, but after finalising Bendre, Kathir then recommended her to his friend K. S. Ravi to cast her in his En Swasa Kaatre (1999).

[15] For a song sequence, red rose petals were used to cover the forecourt of the Taj Mahal in Agra.

[16] For the Hindi dubbed version Dil Hi Dil Mein, Kathir reshot scenes featuring Singh and Anupam Kher to replace the Singh-Manivannan tracks by conversing in Hindi while Johnny Lever's scenes replaced the Goundamani tracks (even though he appeared briefly for the "Chand Aaya Hai" song) with the same Titanic hairstyle.