In Chennai, two high-profile figures are killed and the police commissioner Muthu Kali takes charge of the case. From here, the film is narrated in a non-linear plot. Nallathambi (Rishi Kumar) moves in a slum in Chennai and poses as an orphan. He then meets the soft-spoken Sarasu (Shruthi Raj) and saved her from a local don who harassed her to marry him, Sarasu falls in love with Nallathambi. Nallathambi then shoots dead an advocate in his office. During his escape, Muthu Kali shoots Nallathambi in the leg and his prosthetic leg fell off. Muthu Kali finds out that three victims grew up in an orphanage, a team were behind the murders and the last murderer had lost his leg recently. Sarasu gets the approval of her family to marry Nallathambi. In the meantime, Nallathambi befriends with Muthu Kali's wife Seetha, he invited her and her husband to attend his wedding. The day of the wedding, Nallathambi has disappeared and the wedding is cancelled
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