This is the 5913th most frequent Korean word.
사과의
"사과의" means "of apology" or "apologetic."
In this sentence, '사과의' modifies '마음' to describe the feeling of apology the subject has.
그녀는 사과의 마음으로 편지를 썼습니다.
She wrote the letter with an apologetic heart.
Here, '사과의' modifies '향기' to denote that the scent is originating from apples.
사과의 향기가 방안을 가득 채웠습니다.
The scent of apples filled the room.
In this sentence, '사과의' is used to highlight the significance of 'importance' related to apologies.