Master (2021)
In Nagercoil, 2003, teenager Bhavani witnesses his family get murdered by his father's rivals. He is forced to take the blame and is incarcerated in a juvenile detention facility, where he is tortured mercilessly. As a consequence, he develops a ruthless and brash persona. Years later, Bhavani escapes from the facility and becomes a criminal in the lorry and trade business. Gradually, he becomes a feared gangster, and remains immune from punishment by coercing the inmates of the detention facility to take the blame. Grooming an enormous empire for himself, he grows on par with his father's former rivals and eventually kills them.
The next day, J.D discovers that two young inmates, brothers Sabari and Manikandan, were murdered. He is interrogated by police. A grief-stricken Charu admonishes him for his reckless and negligent behaviour, revealing that she was the one who had signed him up for the job, believing him to be the only teacher capable of understanding the needs of the inmates. She reveals herself as an non-governmental organisation volunteer investigating the crimes occurring in the facility; the brothers had desperately contacted her for help. While in detention, J.D. discovers a letter written by the brothers to him, detailing the horrific activities taking place inside the centre. Heartbroken, he thrashes Bhavani's goons who had been dispatched to kill him and calls him, promising to end his reign of terror and crime. He redeems himself and quits his tryst with alcohol.
Now reformed, J.D. slowly gains control over the institution and begins to reform the inmates, with the help of Charu and the facility's authorities. His actions are opposed by Das, an older inmate responsible for the illegal drugs and alcohol. With the support of a young inmate, Undiyal, J.D. uncovers the various crimes and gets the inmates to record confessions. J.D. discovers that Bhavani regularly makes the inmates take the blame for his crimes. Bhavani's goons target Charu and retrieves the video from her, sparing her only because of Undiyal's timely intervention.
Undiyal reveals that selected inmates of the facility are tattooed with the Tamil letter "Pa", a symbol that allows them unrestricted access to free food and drugs from Bhavani's associates. J.D. targets and raids the respective establishments and cuts off the drug supply to the detention facility, much to Bhavani's frustration. He also sneaks into Bhavani's place and warns Bhavani's men to stand down, threatening them of dire consequences (while unknowingly holding Bhavani himself at knifepoint).
Bhavani retaliates by killing J.D.'s associates. With J.D. distracted, Das drags most of the inmates out of the facility, including Undiyal, to transport them out of Tamil Nadu. J.D., with the help of his friend Vaanathi, who is an expert in archery, manages to subdue Das' men and rescues the children. J.D. then confronts Das and makes him realize that Bhavani only intends to use the latter[clarification needed] as a pawn for his crimes. Das reforms himself and transports J.D. to Bhavani's headquarters. Bhavani attempts to have J.D. and Das killed. The duo subdue Bhavani's men and fights him. He attempts to form a truce and escape, but J.D. overpowers and kills him. With the children safe, J.D. and Das surrender to the police.
The detention facility is shut down by the government, with the inmates being sent to other detention facilities and state prisons, on the basis of their age. J.D. and Das are imprisoned together, indicating the duo's intention to reform the prison's inmates as well.
