The South Indian movie you're looking for is Sulthan (2021) , starring Karthi and Rashmika Mandanna.
The original Tamil and Telugu versions are available on Disney+ Hotstar.
Your search leads to "Filmyzilla," which is one of the most notorious piracy websites in India. Here is why people risk visiting it:
Disney+ Hotstar: The film is available on Disney+ Hotstar in its original Tamil version as well as dubbed versions in Hindi, Telugu, Malayalam, and Kannada.