Karthik (Prithviraj) and Vijayakumar alias Viji (Prakash Raj) are best friends who are keyboard players in music director Vidyasagar's team. They are brilliant in their work of rerecording and background scores. They are fun-loving, witty, and they share a great rapport. They come to live in an apartment complex building where they meet a handful of interesting people. Their irritable flat secretary, Ananthakrishnan (Brahmanandam), is not too happy about Karthik and Viji occupying the flat and asks him to vacate as bachelors are not allowed to live there. Preethi (Neelima Rani), a girl from one of those apartments, is head over heels in love with Karthik.

One day, Karthik sees a girl on the road and is quite impressed by her attitude and guts. Later, he finds out that the girl is Archana (Jyothika), a deaf and mute girl who lives in the same apartment with her grandmother. Karthik falls in love with her, and along with Viji, tries to find out more about her from her best friend Augustine Sheela (Swarnamalya). Karthik learns sign language from Sheela so that he can communicate with Archana. He wants to have her as his life partner, though she considers him as a good friend.

Archana gets angry with Karthik eventually when he proposes his love to her. She thinks that her baby will be disabled just like her. Her father abandoned her after he found out about her handicap, and she is afraid that Karthik will leave her as well if their baby is like her. Karthik tries to reason with her that her father was unaware of her condition, so it took him by surprise and he is ready to accept her and their future children because he knows and understands them. However, his pleas are to no avail. Archana begins avoiding Karthik, and Karthik is heartbroken.

A parallel plot involves Professor Gnanaprakasam (M. S. Bhaskar), who has lost his mental stability when his son Babu died. He refuses to accept the loss and lives in the year 1984, the year his son died. Later, Karthik helps him to break down and realize the grief of losing his son.

Ananthakrishnan also has an instance where he tries and fails to pursue a romantic relationship with a girl through various mishaps. He finally learns to like Karthik and Viji for who they are after Karthik helps Gnanaprakasam to come to his senses.

At the same time, Viji also falls in love with Sheela, who is a widow. Sheela and her parents agree to the marriage, and their marriage date is fixed. Archana decided not to attend the wedding as Karthik would be present, causing a rift between her and Sheela's friendship. This angers Karthik who confronts and tells to deal with her insecurities instead of hiding her true feelings like a coward. Breaking down to tears, Archana arrived on the wedding day and finally confesses to Karthik that she does indeed love him. The story thus concludes with a happy note of Viji and Sheela getting married and congratulating Karthik and Archana.