Karthik (Vishal) is a lazy, jobless, upper middle-class guy and the only son of his father, who is a bank manager (T. S. B. K. Mouli). Karthik is always hanging around with his friends: an auto rickshaw driver named Kumar (Santhanam), a tea shop owner named Shekar (Mayilsamy), and a traffic constable named Vishnu (Sathyan). Over-ambitious in his life, he always wants the best of everything in his life, from pens and clothes to every other accessories, and has made it a rule to try out everything before zeroing in on one. Now wanting to choose his best life partner, he applies the same method and decides to select three girls, whom he would romance at the same time and make to fall in love with him, then reject two of them and finally marry the third one.

Karthik comes across Jyothi (Tanushree Dutta), an athlete living in the poorer area of Chennai, who has reservations against men and slaps a guy for touching her inappropriately and is Karthik's first choice. Karthik later attends a marriage, where he meets Priya (Sarah-Jane Dias), a girl who strongly believes in traditional and cultural values and has the policy of loving and marrying only one boy in her life, and she is Karthik's second candidate. The third one whom Karthik selects is Tejaswini (Neetu Chandra), a rich and arrogant girl and the heir to Rs. 1,500 crores, who once had a failed love attempt in her life. Karthik enters their lives, woos them with lies, and finally wins their hearts. The girls do not know the fact that Karthik is romancing three girls simultaneously and entirely trust him.

One day, thanks to her caring and understanding father Ranganathan (Jayaprakash), who does not want his daughter to sustain one more love failure, Tejaswini gets to know about Karthik's plans and intentions and confronts him. Karthik dumps her and continues to romance Jyothi and Priya, while Tejaswini vows to take revenge on him. Without revealing her own and Karthik's true identity and intentions, she befriends the other two girls and gives advice to each, how to quicken the progress to get married soon, trying to put Karthik under pressure and blow his cover. Soon Jyothi gets to know the truth, wherefore he also rejects Jyothi and settles down with Priya as his future wife, who was responsible for Karthik's change of mind as he has now learnt the value of true love and realizes his mistakes.

However, as Jyothi's rowdy brother Anbalazhagan (Prakash Raj) confronts Karthik that he has betrayed Jyothi, Karthik reveals the truth about himself, his intentions, and the other girls to Priya, who was with him. Downheartedly, she leaves Karthik, who is being beaten up by Anbalazhagan and his gang. Karthik then causes a traffic accident, getting himself tangled and injured in the accident, and gets admitted in a hospital, where Dr. Ramya (Sneha) comes for his treatment. He pretends to have lost his memory due to the accident in order to arouse compassion in Priya and also with the intention to change his behavior to be more loyal to Priya, eventually indeed succeeding in his plan as Priya returns and reunites with him. The film ends with Karthik comically telling the audience about he plans to "live as a new man and love Priya only". The film ends with him asking, "You believe me, right?" to the audience, after which his future is left for the audience to predict.

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