Tamilselvan is a college dropout and does all small jobs, but becomes disinterested. Soon, Tamil moves to Chennai and stays at his uncle AC Shakthivel's house to land in a satisfying profession. His friend Nasar, a courier boy, asks him to deliver a packet at a Khadi shop, where he meets Kavya and falls in love with her, where he becomes a courier boy in order to visit Kavya everyday. Meanwhile, Arun is a high-profile doctor, who forms a team to smuggle stem cells from pregnant women and makes them to take a medicine, which induces abortion. However, a ward boy named Manikandan finds about the smuggling operation when he overhears a conversation between Arun and his colleague.

Manikandan couriers all the details to a social activist Sathyamoorthy in Chennai. When Arun learns that that the package is to be transported, he kills Manikandan and manages to make it look like an accident, where he also attacks Sathyamoorthy, who survives and orders his henchmen to snatch the courier from the courier boy, who is actually Tamil. A chase ensues between Tamil and Arun's henchmen where Tamil manages to subdue Arun and kill him in a road accident, after learning about his plan. Tamil provides the courier to Sathyamoorthy where the stem cell scam gets exposed and Arun's partners are arrested. After this, Tamil receives ₹1 billion (US$13 million) reward for his bravery, where he gives the money to Manikandan's family and moves with Kavya on a date.