jeolmeun sarami unjeonseoge anjassseupnida.

젊다 is the dictionary form, meaning to be young.
When a descriptive verb like 젊다 directly modifies a noun, it changes form:

• 젊다 = to be young
• 젊은 사람 = a young person

So in this sentence, 젊은 사람 means a young person.

This is similar to how Korean often turns descriptive verbs into noun modifiers:

• 작다 → 작은 집 = a small house
• 예쁘다 → 예쁜 꽃 = a pretty flower

So 젊은 사람이 is simply the/a young person as the subject.

이/가 and 은/는 are different subject/topic markers.

Here, 사람이 uses 이, which marks 젊은 사람 as the grammatical subject. It often sounds more like a young person is being introduced or identified as the one doing the action.

• 젊은 사람이 운전석에 앉았습니다.
  = A young person sat in the driver’s seat / It was a young person who sat in the driver’s seat

If you said:

• 젊은 사람은 운전석에 앉았습니다.

then 은 would make the young person the topic, often with a contrastive or already-known feeling, like:

• As for the young person, they sat in the driver’s seat.

So 이 is very natural here if you are simply describing what happened.

Because 사람 ends in a consonant sound. Korean subject markers are chosen like this:

• after a noun ending in a consonant: 이
• after a noun ending in a vowel: 가

Examples:

• 사람이
• 학생이
• 아이가
• 의자가

Since 사람 ends in ㅁ, it takes 이.

운전석 means the driver’s seat.

It is made of:

• 운전 = driving
• 석 = seat

So literally it is driving seat, which in natural English is driver’s seat.

A related word is:

• 조수석 = passenger seat, especially the front passenger seat

The particle 에 often marks a location or destination.

With verbs like 앉다 (to sit / to sit down), 에 marks the place where someone ends up sitting.

So:

• 운전석에 앉았습니다 = sat in the driver’s seat / sat down in the driver’s seat

It is not 에서 here because 앉다 focuses on the resulting location, not the place where an action is actively carried out in the same way as verbs like 먹다, 공부하다, or 일하다 often do.

Compare:

• 의자에 앉다 = sit on a chair
• 방에 있다 = be in a room
• 학교에서 공부하다 = study at school

앉았습니다 comes from the verb 앉다, which means to sit or to sit down.

Breakdown:

• 앉다 = dictionary form
• 앉았- = past tense stem
• 습니다 = formal polite ending

So 앉았습니다 is the formal polite past tense:

• sat
• sat down
• sometimes, depending on context, was sitting

In many cases, the most natural translation is sat down because 앉다 often emphasizes the act of sitting.

Usually, 앉았습니다 most directly means sat down because 앉다 describes the action of taking a seat.

So this sentence most naturally suggests:

• A young person sat down in the driver’s seat.

However, depending on context, English might translate it more loosely as:

• A young person was sitting in the driver’s seat.

If Korean wants to clearly emphasize the ongoing state of being seated, it often uses:

• 앉아 있었습니다 = was sitting

So:

• 앉았습니다 = sat down
• 앉아 있었습니다 = was sitting

Because Korean normally puts the verb at the end of the sentence.

The basic order here is:

• 젊은 사람이 = the young person (subject)
• 운전석에 = in the driver’s seat (location)
• 앉았습니다 = sat down (verb)

So the sentence follows a very common Korean pattern:

Subject + Place + Verb

This is one reason Korean can feel reversed compared with English.

Yes. Korean does not have articles like a, an, and the.

So 젊은 사람 can mean:

• a young person
• the young person
• sometimes even young people in the right context, though here it is singular because of the wording and likely context

The exact choice in English depends on context. Without extra context, a young person is often the safest translation.

Yes. 앉았습니다 is in the formal polite style, which is often used in:

• news reports
• narration
• public announcements
• written descriptions
• polite speech in formal situations

A less formal polite version would be:

• 젊은 사람이 운전석에 앉았어요.

A plain casual version would be:

• 젊은 사람이 운전석에 앉았어.

So the original sentence sounds polite and somewhat formal.

No, that would be incorrect.

With 앉다, the place where someone sits is usually marked with 에, not 을/를.

Correct:

• 운전석에 앉았습니다
• 의자에 앉았습니다
• 바닥에 앉았습니다

Using 을/를 would sound wrong because 운전석 is not the direct object of 앉다 here; it is the location.

No. 젊은 사람 is gender-neutral.

• 젊은 사람 = young person
• 젊은 남자 = young man
• 젊은 여자 = young woman

So this sentence does not tell you whether the person is male or female. Korean often leaves that unspecified unless it matters.

Yes, very much so.

Because it uses the formal past ending -았습니다, it sounds natural in:

• written narration
• witness descriptions
• news-like reporting
• scene-setting

So it can feel like:

• A young person sat in the driver’s seat.
• The young person took the driver’s seat.

It has a slightly observational tone rather than casual conversation.