hoeuisireul kkalkkeumhage jeongrihae nohgo nawasseo.

Because 회의실 is the thing being acted on by 정리하다.

In Korean, 정리하다 means things like to organize / to put in order / to tidy up. So in this sentence, the speaker is tidying the meeting room, which makes 회의실 the direct object.

• 회의실을 정리하다 = to tidy up the meeting room

Even though in English we might say I cleaned up in the meeting room or I left the meeting room tidy, Korean often treats the room itself as the object of 정리하다.

깔끔하게 is the adverb form of 깔끔하다.

• 깔끔하다 = to be neat, clean, tidy
• 깔끔하게 = neatly, tidily, in a clean/tidy way

Since it describes how the room was organized, Korean uses the adverb form:

• 깔끔하게 정리하다 = to tidy up neatly / to leave something nice and tidy

A native English speaker may expect an adjective like neat, but Korean needs the adverb here because it modifies the verb 정리해.

Not exactly. 정리하다 is broader than to clean.

It often means:

• to organize
• to sort out
• to put in order
• to tidy up

So 회의실을 정리하다 can include things like:

• putting chairs back
• arranging materials
• clearing the table
• making the room look orderly

It does not always mean physically washing or wiping things. If you specifically mean cleaning dirt or dust, Korean might use verbs like 청소하다.

So 정리하다 here is closer to tidy up / straighten up / put in order than pure clean.

-아/어 놓다 adds the idea of doing something and leaving it that way.

So:

• 정리해 놓다 = tidy it up and leave it in that tidy state

This is a very common Korean pattern. It often suggests:

1. the action is completed, and
2. the result remains afterward

In this sentence, the speaker is not just saying I tidied the meeting room. They are saying something more like:

• I tidied the meeting room up neatly and left it that way before coming out

That continuing result is important.

This is a very common learner question.

• 정리하고 나왔어 = I tidied it up and came out.
• 정리해 놓고 나왔어 = I tidied it up, left it nicely arranged, and then came out.

The version with -해 놓고 emphasizes the finished state being in place when the speaker left.

So -아/어 놓다 often sounds like:

• do something in advance
• set something up
• leave something done/prepared

In this sentence, it gives a stronger sense that the meeting room was left properly arranged.

Because 나오다 means to come out / to exit, and that matches leaving a room.

From the speaker’s perspective, they were inside the meeting room and then came out of it:

• 회의실을 정리해 놓고 나왔어 = I tidied up the meeting room and came out

Korean often uses 나오다 when exiting an enclosed space like:

• a room
• a building
• an office
• a classroom

If you used 갔어, that would sound more like went somewhere, not specifically came out of the room.

Here -고 links two actions:

1. 정리해 놓고 = having tidied it up / after tidying it up and leaving it that way
2. 나왔어 = came out

So the sentence presents the actions in sequence:

• first, the meeting room was tidied up
• then, the speaker came out

In many cases, -고 can simply mean and, but in action sequences like this, it often naturally feels like and then.

Yes, the subject is omitted.

Korean often leaves out subjects when they are obvious from context. In a sentence like this, the understood subject is usually:

• I
• sometimes we, depending on context

So the sentence could be understood as:

• I tidied up the meeting room neatly and came out

But Korean does not need to say 나는 unless there is a reason to emphasize or contrast the subject.

나왔어 is casual, informal speech.

It comes from 나오다 in the past tense:

• 나오다
• 나왔어

This style is commonly used with:

• close friends
• family
• younger people
• casual conversation

A more polite version would be:

• 회의실을 깔끔하게 정리해 놓고 나왔어요.

So the sentence you have is in everyday informal speech, not formal or honorific speech.

Historically, 놓다 means to put / to place / to lay down, but in patterns like -아/어 놓다, it often works more like a grammar construction than a literal verb.

So in 정리해 놓다, it does not mean physically putting the organizing somewhere. Instead, it means:

• do the action
• leave the result in place

This is why learners often translate it too literally at first. In many sentences, it is better to think of -아/어 놓다 as:

• do and leave done
• finish and keep it that way
• do in preparation

That is the natural sense here.

Often, yes.

Because of -아/어 놓다, the sentence can suggest that the room was left in a good state for afterward. That might mean:

• for the next meeting
• for other people to use
• so everything would be ready
• so the room would stay neat after the speaker left

This idea is not always as strong as in preparation for, but that feeling is often there.

So the sentence can sound slightly more purposeful than just a plain report of past actions.

Yes.

You could say:

• 회의실을 정리해 놓고 나왔어.

That would still mean the speaker tidied up the meeting room and came out.

Adding 깔끔하게 gives extra detail and emphasis:

• not just arranged somehow
• but arranged neatly and cleanly

So 깔끔하게 makes the result sound more polished and satisfactory.

Because the room is not just the place where something happened; it is the thing being organized.

Compare these ideas:

• 회의실에서 일했어 = I worked in the meeting room

  • 회의실에서 is a location

• 회의실을 정리했어 = I tidied the meeting room

  • 회의실을 is the object

So even though the action physically happens in the room, Korean focuses on the fact that the room itself is what was put in order.

That is why 을 is correct here.