jihacheol annaebangsongeul deutgo naseo chulgureul dasi hwaginhaesseoyo.

In Korean, the subject is often omitted when it is obvious from context.

So 지하철 안내방송을 듣고 나서 출구를 다시 확인했어요 can naturally mean:

• I checked the exit again after listening to the subway announcement.
• He/She/They checked the exit again after listening to the subway announcement.

In real conversation, the listener usually already knows who the sentence is about.

지하철 안내방송 is a noun phrase made of:

• 지하철 = subway
• 안내방송 = announcement / guidance broadcast

Together, it means the subway announcement or the announcement on the subway.

This kind of compound noun is very common in Korean.

Because both are direct objects of verbs.

• 안내방송을 듣고 = listen to the announcement
• 출구를 확인했어요 = checked the exit

The object marker -을/-를 shows what the action is directed toward.

• 안내방송 ends in a consonant, so it takes -을
• 출구 ends in a vowel, so it takes -를

-고 나서 means after doing X, then do Y.

So:

• 듣고 나서 = after listening

This pattern emphasizes sequence. It suggests that the first action happened first, and then the second action happened afterward.

In this sentence:

1. listened to the announcement
2. checked the exit again

The verb is 듣다 = to listen/hear.

When you attach -고, you use the stem 듣- plus -고:

• 듣다 → 듣고

It does not become 들고 here, because the ㄷ irregular change only happens before a vowel-initial ending.

For example:

• 듣다 + 어요 → 들어요
  Here the ending starts with a vowel, so ㄷ changes to ㄹ.
• 듣다 + 고 → 듣고
  Here the ending starts with ㄱ, so there is no change.

Both can connect two actions, but -고 나서 is more explicit about doing one thing first and then the next thing afterward.

• 듣고 확인했어요 = listened and checked
• 듣고 나서 확인했어요 = checked after listening

So -고 나서 gives a clearer sense of order and completion.

다시 means again.

So 출구를 다시 확인했어요 means the speaker checked the exit one more time or re-checked it.

This suggests the speaker had already checked it before, but then checked it again after hearing the announcement.

Yes, Korean word order is flexible, especially with adverbs like 다시.

These are all possible:

• 출구를 다시 확인했어요
• 다시 출구를 확인했어요

The meaning stays very similar, but the emphasis can shift slightly.

• 출구를 다시 확인했어요 focuses a bit more naturally on re-checking the exit
• 다시 출구를 확인했어요 can sound like again, I checked the exit

The version in your sentence is very natural.

It comes from the verb 확인하다, which means to check or to confirm.

Breakdown:

• 확인하다 = to check / confirm
• 확인했어요 = checked / confirmed

Grammar-wise:

• 하다 becomes 했어요 in the polite past tense
• So 확인하다 → 확인했어요

This is a very common pattern with 하다 verbs.

Examples:

• 공부하다 → 공부했어요 = studied
• 준비하다 → 준비했어요 = prepared
• 확인하다 → 확인했어요 = checked

확인했어요 is in the polite informal style, often called 해요체.

It is:

• polite
• natural in everyday conversation
• very common in speech

So the full sentence sounds polite and normal for everyday use.

If you changed the style:

• 확인했습니다 = more formal
• 확인했어 = casual, used with close friends or younger people

Yes, very natural.

출구를 확인하다 means to check the exit, often in the sense of:

• checking which exit number to use
• confirming the correct exit
• making sure you should get off at the right place and leave through the right exit

It does not necessarily mean physically inspecting the exit itself. Often it means confirming exit information.

Yes. For example:

• 지하철 안내방송을 들은 후에 출구를 다시 확인했어요.

This means almost the same thing: After listening to the subway announcement, I checked the exit again.

The difference is mostly style:

• -고 나서 = very common and conversational
• -(으)ㄴ 후에 = a bit more formal or written

Both are correct.

Because it functions as a compound noun in Korean.

• 안내 = guidance / information
• 방송 = broadcast

Together, 안내방송 is treated as one lexical unit meaning announcement broadcast or guidance announcement.

Korean often combines related nouns into one word like this.