This is the 5508th most frequent Korean word.
멀리
"Far" or "distantly."
Here, '멀리' describes the location of the mountains, emphasizing their distance from the observer.
저는 멀리 있는 산을 바라봤어요.
I looked at the faraway mountains.
In this case, '멀리서' indicates a direction or source, specifying that the music's origin is distant.
그는 멀리서 들리는 음악 소리를 들었어요.
He heard the sound of music coming from far away.
Here, '멀리' modifies the verb '뛰어 갔어요' (jumped), giving a sense of distance in the action.