- The film seeks to stress that only situations compel people to change and do things that are not in their nature.
- Sasikumar, a son of rich landlord in Kandamanoor leads a happy life and spends all time with his friends. Many times, he goes out of the way to help his friends. One day, he goes to ensure that his friend's (Inigo Prabhakaran) love is conveyed to a girl (Lakshmi Menon), who happens to be his ex-flame. As it happens, she falls in loves with Sasikumar again. But trouble begins here. A murder happens and the blame falls on Sasikumar and then some twist and turns that forms the movie climax.—Anonymous
- Sundarapandian is the only son of Raghupathi, a rich landlord and the village head. He lives in Kandamanoor, near Theni. Murugesan and Arivazhagan are Sundarapandian's close friends from the same town. Arivu had failed his board exams twice and is now in his final year of college, while Sundarapandian completed college two years ago and is now living freely. Arivu falls in love with Archana, who lives in a small village near Usilampatti and sees her daily on the bus from Madurai to Theni. Arivu is scared to propose his love and decides to get the help of Sundarapandian in expressing love.
Sundarapandian, Murugesan, and Arivu board the route bus daily in which Archana travels to her college. Bhuvaneshwaran also loves Archana and travels on the same bus, also trying to propose to her. There arises a clash between Arivu and Bhuvanesh. They resolve it, as Bhuvanesh's native close friend is Sundarapandian's classmate Paranjothi. They give Bhuvanesh 31 days to woo Archana, without any of them intervening, failing which he should not disturb her anymore ever. Bhuvanesh fails and seemingly leaves the way for Arivu. There, it is revealed that three years ago, Sundarapandian had proposed to Archana and she had rejected him. Upon Arivu's urging, Sundarapandian goes to Archana to give his proposal. The next day, Archana suddenly proposes to Sundarapandian, which shocks everyone. Archana likes Sundarapandian and was waiting to meet him to convey her love towards him. Arivu accepts to leave his love, and Sundarapandian accepts Archana, but her parents wanted her to marry their close relative Jegan, although she is not interested.
Archana had asked Sundarapandian not to contact her as she has exams coming. Bhuvanesh uses this time and verbally harasses Archana on the bus. Sundarapandian catches him and warns him not to repeat it. Sundarapandian asks Bhuvanesh to stop following Archana. The next day, Bhuvanesh comes with two of his friends and insults Archana again. Sundarapandian and his friends board the bus halfway, and a clash erupts between Sundarapandian and Bhuvanesh. Suddenly, Bhuvanesh is pushed out of the moving bus, which leads to his death. Sundarapandian is arrested for the murder but gets bailed from the case as it was termed as an accident. Raghupathi agrees to take care of Bhuvanesh's ailing parents and give money for his sister's marriage, but some of Bhuvanesh's friends wait for the right time to take revenge on Sundarapandian. Paranjothi is also angry with Sundarapandian but does not express it.
Meanwhile, Archana's parents try to force her to marry Jegan. Raghupathi comes to Archana's home with a marriage proposal between Archana and Sundarapandian. Raghupathi requests Archana's father Pandi to set aside his ego and fulfil his daughter's wish by getting her married to Sundarapandian. Pandi is convinced by Raghupathi's speech and agrees to the wedding with Sundarapandian. Jegan gets furious knowing that Archana is about to marry someone else. He is even more shocked to know that Sundarapandian is none other than his close friend in college but has lost contact after his college days. Jegan decides to kill Sundarapandian, and Paranjothi decides to help him.
Paranjothi meets Sundarapandian and informs him about Jegan's love towards Archana. He also lies that Jegan is transforming into a drunkard, worrying about his love on the outskirts of the town. Sundarapandian decides to meet Jegan and try to bring back him to normal. In the meantime, Paranjothi and Jegan have planned to kill Sundarapandian when he comes to meet Jegan. Arivu accompanies Sundarapandian while on the way to meet Jegan.
In the outskirts forests of the town, Sundarapandian meets Jegan and requests him to behave normally. He apologizes, saying that he never knew about his love towards Archana before, but Jegan does not listen to Sundarapandian and tries attacking him along with Paranjothi. Sundarapandian pushes them away and tries to escape from the place. Unfortunately, to his shock, Arivu stabs Sundarapandian in his back because he has vengeance regarding his love for Archana.
Sundarapandian feels bad that all his friends betrayed him. However, he retaliates and hits back at Jegan, Arivu and Paranjothi. He tells Jegan that he thought that he want to marry someone by force is good, while Sundarapandian wanting to marry a girl who loves him is wrong. He tells Paranjothi that he knew that Paranjothi sent the thugs to kill him, as one of them was wearing a shirt that Paranjothi had earlier worn. He reveals to Paranjothi that he didn't kill Bhuvanesh but it was actually Arivu who killed him. He took the blame as he thought it was an accident and to save Arivu. He laments that he has lost his closest friends, he is vexed up and leaves.
Sundarapandian and Archana later get married. The movie ends by showing that Sundarapandian did not disclose the betrayal committed by his friends to anyone but instead ended his friendship with them.
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