Two engineering college dropouts and best friends, Sakthi (Gautham Karthik) and Balaji (RJ Balaji) start a shop in Richie street to sell assembled electronic products. Sakthi, who understands the electronic functionalities well, reverse engineers the products and sells them in their shop. Sakthi has also developed a mobile phone which can be assembled by unique parts and thus be heavily custom modified. He meets a final-year engineering student named Asha (Shraddha Srinath), who buys a laptop from him and later claims that he cheated her. They quarrel and later get on and fall in love. She even gets Sakthi's project accepted in a national electronics firm, for mass production in near future. One day, they get a job to fix CCTV cameras in a wealthy man's house. While fixing the job, Sakthi learns that the house belongs to the central Education-HRD Minister Devaraj (Super Subbarayan). Despite properly fixing the CCTV cameras, they are not paid and are insulted.
Meanwhile, Devaraj orders to close several engineering colleges, citing that they do not have either facilities or the required staff power, and around 10 colleges are closed in Chennai. Within 10 days, he approves the colleges which pay him astronomical bribes. As a result, engineering colleges are forced to collect extra fees from the students to match up to Devaraj's bribe. The students from financially weak families are unable to pay last-minute fees as the year end semester is nearing. One such student of final-year commits suicide by touching the live wire on the electric train in front of Sakthi and others. Later, Sakthi realizes that the reason behind the suicide is the bribe paid to Devaraj.
Sakthi uses his technological skills to expose Devaraj's bribe racket through social media and with the help of Balaji and an ally, Gopi ("Kabali" Hari Krishnan), who received a standing ovation for his project in electronics but ends up working as a waiter in a restaurant due to the antics of the politicians and society. He designs an electronic surveillance bug in the guise of a housefly and sends it to the place where Devaraj stores his newfound bribe. Arul (Stunt Silva), Devaraj's brother-in-law, is captured on screen with the cash, and the video goes viral. Though Arul denies any involvement of Devaraj, the media outrage causes the Prime Minister to fire Devaraj from the minister post. Now, Devaraj has to prove himself innocent, so he kills Arul when he was about to reveal Sakthi's name to him. Later, Devaraj captures Sakthi and Asha and assaults Sakthi, but Sakthi tricks Devaraj into revealing the locations of all of his black money, which is recorded by hidden cameras in Asha's house. They engage in a fight where Sakthi kills Devaraj. Sakthi then transmits the footage to the CBI and is lauded for his efforts. He takes a small amount from the confiscated money as his CCTV charges and is reunited with Asha and Balaji.
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