However, I must clarify that is not a widely recognized mainstream Bollywood or Hollywood film. A search of official film databases (IMDb, Wikipedia, Rotten Tomatoes) does not list a notable 2021 release by that exact title with a Hindi dubbed WEB-DL version.

Wait for an official OTT release or watch legally dubbed thrillers mentioned above. Support the art of cinema. If you have the correct original title or country of origin for “Happy End 2021,” please update your search — the film may exist under a different name on legal platforms.