Ninaikkatha Naalillai (2001)

Anbu and Arun (R. Parthiban - Rahman) are bosom buddies with Anbu being indebted to the wealthy Arun for various reasons. Anbu falls in love with Kavitha (Devayani), whose close friend is Kausalya (Kaveri). Arun soon develops a soft corner for Kausalya whom he had never seen. Her lofty thoughts expressed in her letters to Kavita, had attracted him to her. Kausalya reads his messages to her sent through Kavita's letters and finds herself reciprocating to Arun's feelings and the plot thickens