An alcoholic professor, John Durairaj "JD" (Vijay), takes a three-month teaching job at a juvenile home in Chennai, where he clashes with Bhavani (Vijay Sethupathi), a ruthless gangster who uses the children as scapegoats for his criminal activities. JD's initial reluctance turns to determination as he discovers the truth behind the facility's brutal conditions and Bhavani's crimes.