* You might be thinking of a film with a different title. Perhaps you remember a different spelling or a slightly different name. If you can remember any details about the film, like the plot or genre, it might be easier to find it.
* The film could be foreign. "Sert adam" could be a Turkish, Arabic, or another language title. If you know the language, you could try searching in that language.
To help you further, please provide more information:
* What language is the film in?
* Can you remember anything about the plot?
* Do you remember any other details about the film?
Once I have more information, I can help you find the correct film and its cast.