Breakdown of oneureun hoeuiga se gaena isseoseo bappayo.
Questions & Answers about oneureun hoeuiga se gaena isseoseo bappayo.
은 here marks 오늘 as the topic: as for today.
So 오늘은 gives a sense like:
- Today, ...
- As for today, ...
It sets the time frame for the whole sentence. This is very common in Korean when the speaker is talking about what today is like, compared with other days.
If you said 오늘이, that would sound different because 이/가 marks the subject, not the topic.
가 marks 회의 as the subject of 있다 in this sentence.
The structure is basically:
- 회의가 세 개나 있다 = there are as many as three meetings
Then that whole idea becomes the reason for being busy:
- 회의가 세 개나 있어서 바빠요 = I’m busy because there are as many as three meetings
If you changed it to 회의는, the nuance would shift. 회의는 would make meetings the topic or contrastive topic, something like:
- As for meetings, there are three of them...
That is possible in some contexts, but 회의가 is the natural choice here because the sentence is simply stating that meetings exist/are scheduled.