gireul jalmos deureoseo jipkkaji orae geollyeosseoyo.

Because this expression treats 길 as the thing you took/entered onto.

The pattern 길을 들다 means to take a road / choose a route. So in 길을 잘못 들다, the road is the direct object, which is why it uses 을.

A native English speaker might expect something like 길에 because English often thinks of a road as a location, but Korean is framing it more as taking the wrong route.

잘못 is an adverb meaning wrongly, incorrectly, or by mistake.

So:

• 길을 들다 = to take a route
• 길을 잘못 들다 = to take the wrong route / choose the wrong road by mistake

Here 잘못 modifies the verb 들다.

들어서 is 들다 + -어서.

In this sentence, -어서 connects the first action/situation to the result that follows. Here it has a because/so feeling:

• 길을 잘못 들어서 = because I took the wrong road / having taken the wrong road

So the sentence structure is:

• 길을 잘못 들어서
• 집까지 오래 걸렸어요

Together: taking the wrong road caused it to take a long time to get home.

This happens because the stem ends in ㅡ.

With many ㅡ-stem verbs, the ㅡ drops before endings like -어:

• 들다 → 들어
• 들다 + -어서 → 들어서? No
• correct form: 들다 + -어서 → 들어서

So 들어서 is the normal conjugated form.

Not exactly.

In this sentence, 들다 is part of the expression 길을 들다, which means to take a road / choose a route.

So it is closer to:

• take the wrong road
• go the wrong way

rather than literally enter in the English sense.

까지 means up to, as far as, or all the way to.

So 집까지 emphasizes the endpoint:

• 집까지 오래 걸렸어요 = it took a long time to get all the way home

If you used 집에, it would not fit as naturally with 걸리다 in this pattern. Korean commonly says:

• 집까지 오래 걸렸어요
• 집에 가는 데 오래 걸렸어요

Both are natural, but 집까지 is very compact and common here.

The verb 걸리다 can mean to take (time).

So:

• 오래 = for a long time / a long time
• 걸렸어요 = took

Together, 오래 걸렸어요 means it took a long time.

This is a very common Korean pattern:

• 10분 걸렸어요 = it took 10 minutes
• 오래 걸렸어요 = it took a long time

Korean often omits the subject when it is already clear from context.

So even though English would usually say I took the wrong road, so it took me a long time to get home, Korean can simply say:

• 길을 잘못 들어서 집까지 오래 걸렸어요

The listener will understand that the speaker is talking about their own experience.

걸렸어요 is in the polite informal style, often called -아요/어요 style.

It is polite and very common in everyday conversation.

Compare:

• 걸렸어요 = polite
• 걸렸습니다 = more formal
• 걸렸어 = casual, used with close friends or people younger than you

So this sentence sounds natural in normal polite conversation.

They are similar, but not exactly the same.

• 길을 잘못 들다 = to take the wrong road / choose the wrong route
• 길을 잃다 = to get lost

So in this sentence, the speaker is specifically saying they went onto the wrong route. That may lead to being lost, but it is slightly more specific than just getting lost.

Yes, absolutely.

• 집까지 오래 걸렸어요
• 집에 가는 데 오래 걸렸어요

Both mean that it took a long time to get home.

The second version is a little more explicit because it literally says it took a long time in going home. The original sentence is shorter and very natural.

That is close to the structure, yes.

A more natural breakdown is:

• 길을 잘못 들어서 = because I took the wrong road
• 집까지 = to home / all the way home
• 오래 걸렸어요 = it took a long time

So the sentence is built very compactly, but each part is doing a clear job: route chosen wrongly → result → long time to reach home.