This is the 15250th most frequent Korean word.
배성재
"배성재" is a Korean proper noun, typically used as a male given name.
In this sentence, '배성재' is used to refer to a specific person who is a sports broadcaster.
배성재는 스포츠 방송인입니다.
Baesungjae is a sports broadcaster.
Here, '배성재' is used as an example of a proper noun, referring again to a person that the speaker had no prior knowledge of.
나는 배성재라는 사람이 있는지 몰랐어요.
I didn't know there was a person named Baesungjae.
In this context, '배성재' is portrayed as a teacher, shown with the honorific suffix 선생님, indicating respect and the occupation of teaching.