Ajay, an educated youth comes to Chennai from his hometown, Theni to take up a job. Anjali, a photographer from London is also in the city to capture the South Indian culture on camera. The duo are deceived by Narayanan, a real estate broker, who rents out unoccupied houses without informing the house owners. Ajay and Anjali pay the rental money to Narayanan and end up signing the same house. Unable to find another house to rent, the duo decide to stay together, till they find Narayanan. They squabble and argue a lot, but soon Ajay falls in love with Anjali. However, he does not reveal to her of his feelings. After taking her on a trip to Theni, he realises that she does not reciprocate his feelings, leaving him depressed.

Soon, Ajay tracks down Narayanan, who he met in a chance encounter earlier, where Ajay pockets Narayanan's address from his wallet, and blames him for the misery in his life, because it was Narayanan's trickery that brought them together and now, Ajay cannot live without her love. Narayanan decides to help Ajay and he visits the house, under the pretense of being Ajay's friend, Billa Senthil. He tries to make Anjali fall for Ajay. Anjali's fiancé, Deepak then gives Anjali a surprise visit, just as when she begins to enjoy Ajay's company. Narayanan continues to try to getting Ajay and Anjali together, but with no success.

On the night of Anjali's birthday, Ajay decides that she will never love him, and resorts to drinking, after being depressed. Meanwhile, Anjali realises that she loves Ajay, but is angry at his behaviour under the influence of alcohol. The next day, she goes to the wedding of Ajay's colleague as his wife, due to the fact that his colleagues think she is his wife and looks for him there. Just when they find each other and are about to confess their feelings for one another, Narayanan speaks on the phone with some new tenants. When he jokingly offers Ajay a cut of the deal, Anjali misunderstands Ajay as a fraudster, assuming that he also was in the same house plot Narayanan created. Heartbroken, Anjali shouts at both of them as tricksters and leaves the wedding hall in tears. Shattered, Ajay looks on in guilt.

Three months later, Anjali has returned to London and wins her photography contest. Deepak tells her that Narayanan had told him everything from scratch, and that Ajay is innocent. He convinces her that she loves Ajay and vice versa, as she did not hesitate to visit Theni or act as Ajay's wife despite being engaged to Deepak. Anjali comes back to their apartment, and looks for Ajay, but does not find him. At the same moment, Ajay opens the door and finds his passport that he was looking for. Anjali meets him at last and is initially upset at him. She asks him why he did not come to woo her for the last three months in London. Ajay tells her that he had just received his passport and was planning to leave for the airport. As the two hug and reconcile, Narayanan enters, with a prospective victim to trick, and shows him the house. The two shout at Narayanan and comically punch him in front of the new tenant. The film concludes showing the same deceiving trick that brought the couple together.