This is the 7444th most frequent Korean word.
최재성
"최재성" is a Korean name, typically referring to a person.
In this sentence, '최재성' is used as a proper noun, referring to a specific person's name.
최재성은 한국에서 매우 인기 있는 배우입니다.
Choi Jae-seong is a very popular actor in Korea.
Here, '최재성' is used as a name of a new student mentioned in the context.
우리 반에 최재성이란 학생이 전학 왔어요.
A student named Choi Jae-seong has transferred to our class.
In this usage, '최재성' acts as a reference to the giver of the gift, showing him as a subject in the action described.