This is the 18371st most frequent Korean word.
슬픈
Sad.
In this sentence, '슬픈' also functions as an adnominal form, modifying the noun '이야기' (story) to express the story’s emotional quality.
슬픈 이야기를 들었을 때 마음이 아팠어요.
When I heard a sad story, I felt heartache.
Here, '슬픈' is used descriptively to specify the feeling or mood conveyed by the noun '느낌' (feeling).
그 노래는 정말 슬픈 느낌을 준다.
That song really conveys a sad feeling.
Here, '슬픈' is used as an adnominal form to describe the noun '영화' (movie), expressing the emotional nature of 'movie'.