That being said, I'll provide you with some general information and alternatives.
To avoid any risks, I recommend watching "Mithya" on Amazon Prime Video or other official platforms. Not only will you enjoy high-quality video and audio, but you'll also be supporting the creators and respecting their intellectual property rights.
Tamilrockers is a website infamous for leaking copyrighted content, including movies, TV shows, and web series. The site has been blocked multiple times by authorities, but it continues to operate through mirror sites and proxy servers.