The film starts with the death of a renowned neurologist named Pramodh (R. Amarendran). His gym trainer Dheena (Sai Dheena) is seen paying respects at the funeral before leaving. The plot then shifts to a young crime inspector named Kumaran (Sundeep Kishan), who is chasing a petty thief and witnesses Dheena murdering his wife. Kumaran chases Dheena, who corners him and halts him with a blow to his head. In an ensuing tussle, Kumaran manages to kill Dheena.
A meeting with psychiatrist Aadhirai (Lavanya Tripathi) ends on a rough note when she deems him medically unfit to rejoin the police force. Later, when he faces symptoms which attribute to PTSD, he mends his ways with Aadhirai, who helps him overcome his disorder. A second murder happens in which a famous actress is killed. Kumaran visits the spot and gets stressed and shocked upon finding the similar blood stains from the earlier murder and the same brand of cigarette smoked by the murderer. Aadhirai finds him, treats him for his PTSD, and makes him normal. Kumaran meets with Rudhran (Daniel Balaji) and introduces Aadhirai to him as a motivational speaker. Kumaran, now fitter, sets out his investigation and finds that a makeup man named Gopi (Mime Gopi) must have done the murder as he is the prime suspect. Upon investigation, he gets to know that Gopi and Dheena showed a totally different behavior a few days before they committed the murders. Kumaran tracks down Gopi, but he jumps to his death before confessing anything.
The next murder happens, and the victim is another scientist named Narayanan (Kathi Ravi). Kumaran tries to find evidences in Narayanan's home and finds a book written by Rudhran. Thinking that Rudhran might know the scientist, Kumaran visits his office and finds that his behavior has changed. His own dog starts to bark at him, and he has also started to smoke recently, that too the same brand that was found in the earlier murders. Kumaran deduces that some strange thing is happening, and Rudhran could either be murdered or become the next murderer. He nabs Rudhran when he shows his more ruthless and cold-blooded side when he kills his dog. Kumaran takes Rudhran into custody. While signing on the FIR, Rudhran signs a different name but corrects it to his own sign. Kumaran notices this and finds out that the first sign was signed "Pramodh".
A brief investigation reveals that Pramodh is a late colleague of Narayanan. They worked together at the Indian Institute of Neurosciences. A senior official named Velayudham (Jayaprakash) reveals that Pramodh was involved in a project called Project Maayavan, which could enable a person to store their memories into a hard drive, which can be transferred to another individual by injecting a gel which would house millions of nano-transmitters. When injected into the brain, these transmitters will attach onto the neurons. When the person dies, their memories could be transmitted to another individual whose brain would already have been injected with the gel. The memories of the new person will first be erased, and the old person's memories will be transferred via the nano-transmitters. This way the person (their memories) will not die and will instead live forever.
To prove his theory, Pramodh works day and night. During this experiment, he sends a patient into a coma but is not bothered about human life and instead wants to succeed in his mission. After Narayanan becomes the Director of the Indian Institute of Neurosciences, he stops Pramodh's project. Pramodh uses himself as the subject, transfers his memories in a hard drive, and commits suicide. Once he dies, his memories get transferred to his trainer, and then to Gopi and then Rudhran. Kumaran solves this and finds that the next target is Army general Major Sathyan (Jackie Shroff).
20 years later, Kumaran is happily married to Aadhirai, and they have a son. It is shown that Kumaran has trapped Sathyan in his basement and has kept him alive.
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Film & Animation