I had thought about this before and now I saw that the team from JapanesePod101 already have it (or started to have it?), it is also something that can be found in Korean frequently
Onomatopoeia!!
I will never forget that
산타 하라버지는 벙글벙글 웃었습니다.
or that the stars shine 반짝반짝.
Is 깜작 놀았슴니다 also onomatopoeia?
Anyways, I'm not sure I spelt them all correctly but I'm sure you can think of more examples and it would be nice to have a short series on this topic