raunjieseo oraesdongan ilhaesseoyo.

에서 marks the place where an action happens.

So in 라운지에서 오랫동안 일했어요, 라운지에서 means in/at the lounge, specifically the lounge is the place where the person worked.

Compare:

• 라운지에서 일했어요 = worked at the lounge
• 라운지에 있어요 = am at the lounge

A useful shortcut:

• 에 often marks location/existence or destination
• 에서 often marks the location of an action

Because 일하다 is an action verb, and Korean usually uses 에서 for the place where an action takes place.

So:

• 라운지에서 일했어요 = worked at the lounge
• 라운지에 일했어요 = not natural

You use 에 with things like:

• 라운지에 있어요 = am in the lounge
• 라운지에 갔어요 = went to the lounge

So for working, 에서 is the natural choice.

오랫동안 means for a long time.

It describes the duration of the action 일했어요.

So:

• 오랫동안 일했어요 = worked for a long time

It can mean either:

• for many hours on one occasion, or
• over a long period in life / at a job

The broader context tells you which meaning is intended.

Yes. 오래 일했어요 is very natural and common.

Both mean roughly worked for a long time, but there is a slight nuance:

• 오래 일했어요 = worked for a long time
• 오랫동안 일했어요 = worked for a long time / for a long period

오랫동안 can sound a little more explicit or emphatic about the length of time.

So both are fine in everyday Korean.

It comes from the dictionary form 일하다 = to work.

Breakdown:

• 일하다 = to work
• verb stem: 일하-
• past tense marker: -았/었-
• polite ending: -어요

Because 하다 becomes 했어요 in the past polite form:

• 일하다 → 일했어요

This is a very common pattern:

• 공부하다 → 공부했어요
• 운동하다 → 운동했어요

In many cases, it can correspond to either worked or have worked in English, depending on context.

Korean past tense does not always match English tense one-to-one.

So 라운지에서 오랫동안 일했어요 could mean:

• I worked at the lounge for a long time
• I have worked at the lounge for a long time

But in most neutral situations, learners will first understand it as simple past: worked.

Context decides the most natural English translation.

Because Korean often leaves out the subject when it is already understood from context.

So 라운지에서 오랫동안 일했어요 could mean:

• I worked at the lounge for a long time
• He worked at the lounge for a long time
• She worked at the lounge for a long time
• They worked at the lounge for a long time

Korean does this very often. If the speaker and listener already know who is being talked about, the subject is usually omitted.

일했어요 is in the polite informal style, often called the -어요 style.

It is polite and very common in everyday conversation.

Compare:

• 일했어요 = polite, everyday
• 일했습니다 = more formal
• 일했어 = casual, used with close friends or younger people

So this sentence sounds polite and natural in normal conversation.

Not completely. Korean word order is flexible as long as the particles and overall structure remain clear.

These are all possible:

• 라운지에서 오랫동안 일했어요
• 오랫동안 라운지에서 일했어요
• 라운지에서 오래 일했어요

The most neutral pattern is often place + time/duration + verb, but other orders are common too, especially for emphasis.

The verb usually comes at the end.

Yes. 라운지 is a loanword from English lounge, written in Korean pronunciation.

So:

• 라운지 = lounge

Korean uses many loanwords like this, especially for places, food, technology, and modern culture.

By itself, it can mean either.

일했어요 simply means worked. It does not automatically tell you whether this was:

• a regular job
• part-time work
• temporary work
• work done on one occasion

If you want to be more specific, Korean would usually add more information, such as:

• 아르바이트했어요 = worked part-time
• 직원으로 일했어요 = worked as a staff member
• 한동안 일했어요 = worked there for a while

So the basic sentence leaves that detail open.