Watch Zir Khaki Season 4 Posteh Sahneh (زیرخاکی فصل چهارم قسمت پشت صحنه) is a Iranian Serial that is very popular. The series Zir Khaki written and directed by Jalil Saman and produced by Reza Nasirinia. will be aired every night during the month of Ramadan on the One Sima network.