@Hasan1994
Sayyid (Arabic: سیّد, feminine: Sayyida(سیّدة), Arabic plural: Sada (سادة); noun: Siyada (سیادة)) is an Arabic honorific title denoting descendants of prophet Muhammad (s). According to fiqh, it is a title given to the descendants of Hashim b. Abd Manaf (the Prophet's great grandfather).
https://en.wikishia.net/view/Sayyid
Not sure is Saad is in the name of that poster means that he is a Sayyid