Shanmugamani arrives as a Tamil language teacher to a school. He is an alumnus of the same school, from where he studied very well, despite his poor background, he was state first in his twelfth (+2) exams. He is fooled by the students of twelfth standard, headed by a brilliant, but mischievous student Priya. Shanmugamani is irritated by her indiscipline and finds fault for whatever she does. But this does not stop Priya to crack pranks on him. There is also a student in the same class, who studied in school with Shanmugamani, and has not yet passed +2. Priya's classmates create a fake love letter written by Priya and put it in Shanmugamani's desk. Shanmugamani misunderstands that, it is also one of the pranks of Priya, warns her and gives the letter to her. But Priya considers that he wrote the love letter and falls in love with him. Priya's classmates repeat the mischief again and again and Shangmugamani misunderstands it as Priya's mischief and complaints to the Headmaster, because of which Priya is suspended without any chance to defend herself.
Later on, Shanmugamani understands that there is no fault with Priya and apologises to her. Priya, who also finds the truth insists since both their reputations have been spoiled in the school, it is better that both get into love and marry. Scared by her acts, Shangmugamani keeps away from her. But Priya does not lose her heart and she chases him to win his love. But Shanmugamani insists that it is not a good ethic for a teacher to fall in love with his student and reveals that he is not willing to marry her. Priya seeks TC from her school, discontinues her studies and pressures that she is not his student any more and he can marry her. Yet Shanmugamani does not yield to her. Priya shifts to her friend's home as a paying guest, which is next to Shanmugamani's house and makes her full-time job to love him. Unable to resist her torture, Shanmugamani marries a girl named Deivanai from an orphanage, which shocks Priya.
Shanmugamani has a great dream about his wife, but Deivanai does not have any qualities of his dream girl, yet she manages somewhat to live to her husband's expectations. Priya understands her situation and helps her without her knowledge. But when Deivanai finds the truth she gets furious that Priya tries to snatch away her husband from her and warns her that if she ever turns her face towards her husband, she would go violent. But later, Deivanai finds that Priya was his student and feels bad for her acts. Priya and Deivanai become good friends. Priya helps Deivanai to cook, to speak in English and all the ways to attract her husband. But the Priya-Deivanai relationship is not liked by Shangmugamani and he insists Priya to keep away from their life. Priya, on one hand, helps Deivanai and on the other hand, makes her attempt to win Shangmugamani's love and become his wife before her death. He gives a final warning to her that Deivanai will not keep quiet if she ever discovers Priya's attempt on him. Deivanai hears their conversation, but does not react to that, instead she her drags to hospital for a check-up. When Shangmugamani wonders why, Deivanai explains that she got a handkerchief of Priya with blood stains. Finally both come to know Priya is battling with her life with cancer and counting her days. Deivanai insists Shangmugamani to marry Priya so that her last wish is fulfilled. But Priya dies in her school in her classroom in the place where she sat wearing her school uniform.
In her last speech recorded on a tape, she praises Shangmugamani for being stubborn that a teacher should not marry his student at any cost. She presents her jewels to Deivanai and says she will be born again as their child. At the end, Shanugamani and Deivanai put the jewel on their baby, considering that Priya is born again.
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