This is the 17250th most frequent Korean word.
서인석
"서인석" is a Korean name and does not have a specific definition outside of being a proper noun for an individual.
Here, '서인석' is used as a proper noun referring to a specific individual's name.
서인석은 한국의 배우입니다.
Seo In-Seok is a Korean actor.
Here, '서인석' is again used as a proper noun, but this time it is the direct object of the verb '만나다', showing interaction with the person.
서인석을 아침에 만났습니다.
I met Seo In-Seok in the morning.
In this sentence, '서인석' is used possessively with the particle '의', indicating ownership or relation to '연기' (acting).