This is the 8073rd most frequent Korean word.
day
The Korean word for "day" is "날", meaning a 24-hour period.
In this sentence, '날' is used to simply mean 'day', referring to the current date being special.
오늘은 특별한 날이야.
Today is a special day.
Here, '하루' is used to mean 'a day', emphasizing the period of one whole day.
그는 하루 종일 일을 했어요.
He worked all day long.
In this sentence, '날' as part of '날이' suggests the plural form 'days', indicating a duration spanning multiple days.