The difference between 아련한 그리움만 쌓이네 and 아련한 그리움만 남아있네?
I've been searching and searching for the meanings and honestly, I'm confused. Please help me!

Question

Answer

쌓이다 : be accumulated
남다 : be left

So, 쌓이다 is more of a way of illustrating how the feeling of missing someone keeps being accumulated in one's heart.

남다 feels more like, there is something left in one's heart.