Aryan, an
NCB officer in
Chennai, works with his teammates Sathya and Varun to eliminate drug lords known as ''Snake's Den''. Aryan lost his twin brother Dilip due to drug addiction, which led him to become an NCB officer. Alongside Aryan's team are his team supervisor Selvam and Mugilan, a
social activist and Aryan's neighbour. Aryan returns home and receives a news that Selvam has died due to a gunshot. Aryan and Sathya investigate around Selvam's house, where they concludes that a
drug lord was also involved in Selvam's death. Mugilan is also targeted by the drug lord and his bodyguard also gets killed. Before his death, Mugilan provides information about the drug lord in a
USB stick, attached to the collar of his dog Pogo and sends Aryan a message. Aryan tracks down Pogo with the tracking chip installed in his collar and checks the information. The drug lord is Diwakar "DK" Kumaran, a philanthropic businessman and drug trafficker. Mugilan suspected DK's early source of income was with links of international
drug cartels. DK and his brother Rudra had links with politicians so that their business cannot be derailed. Knowing this, Mugilan and Selvam decided to investigate a place thought to be D.K's secret hideout, but they were both caught. Aryan finally concludes D.K's role in drug dealing, while DK deduces that Aryan and his team are after him and abducts Aryan's family. DK tells Aryan to meet his doom at a
warehouse. With a plan, Aryan and his team tries foiling DK's plans in one night and finally manages to catch DK, who kills himself to prevent going into custody. In his dying moments, DK tells Aryan that he is not the main drug lord. It is later revealed that Dilip is actually alive and is the main drug lord with codenames
Dexter and
Cobra. DK and Dilip were best friends. After escaping from a police attack, Dilip had faked his death when he and DK found a bounty to start their drug business. After learning Aryan's involvement in DK's death and destroying his business, Dilip reveals his identity to Aryan and swears to exact vengeance. == Cast ==