“Akkapda” (아깝다) — the pang of something good going to waste
Used about leftover food, misspent money, unused talent and people who died young — all with the same short word, because it is built around value rather than judgment.
aswipda
“Aswipda” (아쉽다) — a shame, and not the same as 서운하다
One of these is a warm goodbye and the other is an accusation. In English they both look like mild disappointment, which is how learners end up insulting people they meant to compliment.