Enemy (2021) on Netflix

Plot summary

1996: In Ooty, Chozhan Ramalingam and Rajiv Parirajan are two friends who are trained by Parirajan, Rajiv's father who is an ex-CBI officer. He enables them to join the police force. Although given equal training, Chozhan appears to best out Rajiv, causing the latter to turn jealous of the former. One day, Chozhan and Rajiv are playing chess in which Rajiv wins. While Rajiv leaves Chozhan pondering over the outcome, he sees Parirajan dead on the floor. The boys are escorted to the police station and although Chozhan tells the inspector and Ramalingam, Chozhan's risk-averse father, that he can bust the killer using his skills, Ramalingam takes Chozhan away, leaving Rajiv alone.

2021: Chozhan becomes a departmental store owner, run by Ramalingam in Singapore. However, he has now evolved into a part-time vigilante and secretly thwarts minor crimes and corruption to help the Tamil community, One day, a gas company near his store suddenly bursts, which kills 11 Tamil people and severely injures five more. Chozhan nabs Joseph, the painter, who is behind the mess and hand him over to the police. The next day, Arundathi Mohan, who is the Indian External Affairs minister, comes to Singapore to address the Tamil people, but struggles to speak at the gathering and Chozhan immediately senses that her artificial cardiac pacemaker had been tampered by someone, and shoots to save her.

Chozhan is caught by the police but is later released after they realized that he saved her.