raunjieseo keopireul masyeosseoyo.

라운지에서 means in the lounge or at the lounge.

The noun is 라운지 = lounge, and 에서 is a location particle that often marks the place where an action happens.

So in this sentence:

• 라운지 = lounge
• 에서 = at/in (where the action takes place)

Because drinking coffee is an action, Korean uses 에서 for the location of that action.

A useful comparison:

• 학교에서 공부해요. = I study at school.
• 카페에서 만났어요. = I met someone at a café.

를 is the object particle. It marks 커피 as the thing being drunk.

So:

• 커피 = coffee
• 커피를 = coffee + object marker

In Korean, the thing that receives the action often takes 을/를:

• 물을 마셔요. = I drink water.
• 책을 읽어요. = I read a book.

Which form you use depends on the final sound of the noun:

• 을 after a consonant
• 를 after a vowel

Since 커피 ends in a vowel sound, it becomes 커피를.

In casual speech, Koreans sometimes drop object particles, so you may hear 커피 마셨어요 too. But 커피를 마셨어요 is clear and standard.

마셨어요 is the past polite form of 마시다 (to drink).

Breakdown:

• 마시다 = to drink
• verb stem: 마시-
• past marker: -었-
• polite ending: -어요

So:

• 마시어요 contracts to 마셔요 = drink / am drinking
• 마시었어요 contracts to 마셨어요 = drank

This contraction is very common in Korean.

Related forms:

• 마셔요 = drink / drinks / am drinking
• 마셨어요 = drank
• 마십니다 = drink / drank? No—this is present/formal
• 마셨습니다 = drank, formal

Korean often omits the subject when it is understood from context.

So 라운지에서 커피를 마셨어요 could mean:

• I drank coffee in the lounge.
• He drank coffee in the lounge.
• She drank coffee in the lounge.
• We drank coffee in the lounge.

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

If you want to include the subject, you can:

• 제가 라운지에서 커피를 마셨어요. = I drank coffee in the lounge.
• 그가 라운지에서 커피를 마셨어요. = He drank coffee in the lounge.

But in everyday Korean, leaving it out is very natural.

Korean normally uses Subject-Object-Verb word order, so the verb usually comes at the end.

This sentence follows that pattern:

• 라운지에서 = in the lounge
• 커피를 = coffee
• 마셨어요 = drank

So literally, it is closer to:

In the lounge coffee drank.

That sounds strange in English, but it is normal in Korean.

A very common Korean pattern is:

[place] + [object] + [verb]

For example:

• 집에서 밥을 먹었어요. = I ate a meal at home.
• 카페에서 책을 읽었어요. = I read a book at a café.

Yes, 에서 can sometimes mean from, but not in this sentence.

It has two common uses:

1. Location of an action

   • 학교에서 공부해요. = I study at school.

2. Starting point / from

   • 서울에서 왔어요. = I came from Seoul.

In 라운지에서 커피를 마셨어요, the verb is 마셨어요 (drank), so 에서 is showing where the drinking happened, not where something came from.

So here it clearly means in/at the lounge.

마셨어요 is in the polite casual style (often called 해요체).

It is very common in everyday conversation and is appropriate in many situations:

• talking to strangers politely
• talking to coworkers
• talking to people older than you in many normal contexts
• everyday conversation

It is less formal than 마셨습니다, but more polite than 마셨어.

Compare:

• 마셨어요 = polite everyday
• 마셨습니다 = formal polite
• 마셨어 = casual / intimate

So this sentence sounds natural and polite in ordinary speech.

No. 라운지 is a loanword from English lounge.

Korean uses many loanwords, especially for modern places, objects, food, and technology.

Examples:

• 커피 = coffee
• 카페 = café
• 호텔 = hotel
• 라운지 = lounge

Even though these come from English, their pronunciation follows Korean sound rules, so they may not sound exactly like the original English words.

A more formal version is:

라운지에서 커피를 마셨습니다.

The meaning is the same, but 마셨습니다 is more formal than 마셨어요.

Use -습니다 style in situations like:

• presentations
• announcements
• interviews
• formal writing
• speaking very respectfully

So:

• 라운지에서 커피를 마셨어요. = polite everyday
• 라운지에서 커피를 마셨습니다. = formal polite

Yes, Korean word order is more flexible than English, as long as the particles make the roles clear.

For example, these can all be understood similarly:

• 라운지에서 커피를 마셨어요.
• 커피를 라운지에서 마셨어요.

Because:

• 에서 still marks the location
• 를 still marks the object

However, the most natural order often depends on what you want to emphasize and what sounds smooth in context. The original sentence is very natural.

The one thing that usually stays the same is that the verb comes near the end.

It is pronounced roughly like ma-syeo-sseo-yo.

A few helpful notes:

• 시 + 어 contracts into a 셔 sound
• so 마시었어요 becomes 마셨어요
• the ㅆ in 셨어 gives a tense ss sound

A slow breakdown:

• 마 = ma
• 셨 = shyeot / syut-like sound, depending on how you hear it
• 어요 = eo-yo

A natural pronunciation is close to:

마셔써요

That is not the spelling, but it may help you hear the spoken form.

Yes, in everyday spoken Korean, people often drop object particles when the meaning is already clear.

So you may hear:

라운지에서 커피 마셨어요.

This still means I drank coffee in the lounge.

However:

• 커피를 마셨어요 sounds more complete and textbook-standard
• 커피 마셨어요 sounds natural and conversational

As a learner, it is good to understand both, but using 를 is perfectly safe and correct.