Surya (Ramesh), an introvert by nature loves his classmate Priya (Pooja) from childhood but has never expressed his feelings towards her. Meanwhile, Surya’s another classmate Ajay also tries to woo Priya in which he succeeds to an extent. Priya does not like Surya as she views him as a nerd. One day, Surya gets frustrated as he is not being liked by anyone and cries loudly in a beach where he finds a small idol of a God. He holds the idol saying that it is better to be invisible in this world rather than being disliked by everyone.

Jagan (R. Madhavan) and Jamuna (Amogha) meet in a shopping mall in Chennai. They like each other and spend a day chatting in the coffee shop. Jamuna, a believer in destiny, writes down her address and phone number on a Rs.100 note and makes the payment at the cafe declaring that if the note comes back to Jagan, then it means that he was destined to meet her. He tries hard to trace the note, but in vain. Jamuna goes back to Kolkata. Meanwhile, Seema (Pooja), who was rescued by Madhavan from some thugs, has a crush on him. Jagan, unable to find Jamuna, agrees to marry Seema. Finally, Jagan manages to get Jamuna’s address on the eve of her wedding and unites with her.

Vijay (Arjun) is a hitman who works for Sundaramoorthy (Radha Ravi). He kills anybody for a price, other than women and children and he lives alone in an apartment. Pooja (Pooja), a young girl, studies in a boarding school and comes to her father’s house for the holiday. Between her abusive father, selfish stepmother and an arrogant step-aunt, Pooja feels rather badly but she treasures her lovely little brother Dinesh (Mahanadi Dinesh). Pooja tries to befriend Vijay but Vijay is not interested. Her father is a drug smuggler. One day, a corrupt police officer Jayanth (Raghuvaran) kills Pooja’s family including her brother. Vijay decides to accommodate Pooja and Pooja compels him to teach her his skills as a hitman. What transpires later forms the crux of the story.