It sounds like you're looking for the hit South Korean action thriller, The Gangster, The Cop, The Devil (2019), likely through a platform like for a Tamil-dubbed version.
The story follows an unlikely alliance between a hardened crime boss and a maverick detective: Gangster Cop Devil Tamilyogi
| Movie (Year) | The Gangster | The Cop | The Devil | Legal Platform | | :--- | :--- | :--- | :--- | :--- | | Vikram (2022) | Vijay Sethupathi (Sanjay) | Kamal Haasan (Agent Vikram) | Rolex (Suriya – cameo) | Netflix / Hotstar | | Jailer (2023) | Rajinikanth (Muthuvel Pandian) | Vasanth Ravi (Cop son) | Vinayakan (Varman – the devil) | Amazon Prime / Sun NXT | | Leo (2023) | Vijay (Parthi/Leo) | Mysskin (Cop) | Anurag Kashyap (Antony – the devil) | Netflix | | Kaithi (2019) | None (but convicts) | Karthi (Cop) | Arjun Das (Anbu – the devil) | Hotstar | | Master (2021) | Vijay Sethupathi (Bhavani – gangster) | Vijay (JD – teacher/cop) | The system itself is the devil | Amazon Prime / Hotstar | It sounds like you're looking for the hit
It sounds like you're referring to a phrase combining multiple keywords: "Gangster," "Cop," "Devil," and "Tamilyogi." The Devil (2019)