The film opens with a grim, bearded, and angry young man named Guru (S. J. Surya) paying tributes to his former lover Priya (Sayali Bhagat) in a graveyard.

In a flashback, their love story is told. Guru, a fashion designer, falls head over heels for Priya, an anchor working in Eagle TV's music channel. After initial hiccups, both fall in love and decide to get married. However, things turn awry when the aggressive, almost maniacal channel owner Jayaprakash Narayanan alias JP (Rajiv Krishna) has a psychotic obsession for Priya and harasses her. On the eve of Priya's wedding, JP kidnaps her, frames Guru in a false case, puts Priya on virtual house arrest, brutally rapes and kills Priya, and makes it look like a suicide.

Back to the present, Guru and his friend Raghu (Sashikumar Subramani) work in the channel, and Guru meticulously plans for a year to take revenge. In a chilling and cold-blooded way, Guru tells JP that the latter will be dead at 12:00 PM, but JP does not know who is speaking. Guru threatens JP to use his old friend's car and go to Koyambedu. JP calls his henchman Deva (Yugendran) to kill him, but Guru, knowing this, manages to get him beat up. He comes and saves JP but arranges income tax officers to arrest JP for having black money in the car. He also threatens JP that he would send him a video that has JP giving money to the minister (John Amrithraj).

JP identifies that it is Guru doing this work because Priya was killed on Valentine's Day, so he plans to take revenge on Guru by killing him. Guru, working as a pizza delivery boy, catches and beats JP. Guru then surrenders himself to the police to escape from JP, though he tells the police about JP. Guru comes to JP and tells that JP's lover, who was cheated by him, has uploaded the rape video of Priya by him. Guru ties and beats JP and cries for Priya's death. However, Deva beats Guru and JP breaks his hands.

Finally, in the climax (inspired from an English movie Shoot 'Em Up), when Guru is unable to hold the gun properly and shoot, he places the cartridges between his fingers and gets his hand close to the fire, by which he performs the action of a gun using his hand and kills JP at 12 PM sharp.