jigeumeun jeomsimsiganiraseo sikdange sarami manhgesseoyo.

은 is the topic marker. So 지금은 means something like as for now or right now.

Using 지금 alone just means now.
Using 지금은 adds a slight topical or contrastive feeling, such as:

• right now, at least
• at this time
• for the moment

In this sentence, it helps set the scene: as for now, since it’s lunchtime...

점심시간 is a noun meaning lunchtime or the lunch hour.

It is made from:

• 점심 = lunch
• 시간 = time / hour

So literally it is lunch time.

-이라서 / -라서 means because it is... or since it is... when attached to a noun.

Here:

• 점심시간 = lunchtime
• 점심시간이라서 = because it is lunchtime

This grammar is used after nouns:

• noun ending in a consonant + 이라서
• noun ending in a vowel + 라서

For example:

• 학생이라서 = because (someone) is a student
• 의사라서 = because (someone) is a doctor

Since 시간 ends in a consonant, 이라서 is used.

Because 점심시간 is a noun, and when you connect a noun to because, Korean uses the 이다 pattern:

• noun + 이라서 / 라서

So:

• 점심시간이라서 = because it is lunchtime

You do not use a verb/adjective connector directly here. The sentence is treating 점심시간 as it is lunchtime, so the hidden copula 이다 is part of the grammar.

This is a very common learner question.

With expressions like 있다, 없다, 많다, and 적다, the location is often marked with 에, not 에서, because the sentence is describing existence or quantity in a place, not an action happening there.

So:

• 식당에 사람이 많다 = There are many people in the restaurant/cafeteria.

By contrast, 에서 is usually used for where an action happens:

• 식당에서 밥을 먹어요 = I eat at the restaurant.

So in this sentence, 에 is correct because it means in the restaurant, there are many people.

In 사람이 많다, 사람이 is the subject of 많다.

Korean uses the pattern:

• Noun + 이/가 많다 = there are many noun(s) / noun(s) are many

So:

• 사람이 많다 = there are many people

Why not the others?

• 사람은 would make people the topic, which changes the emphasis.
• 사람들을 is an object form, but 많다 does not take a direct object here.

Also, Korean often does not need a plural marker. 사람 can already mean people in this kind of sentence.

Because Korean often leaves plurality unmarked when it is already obvious from context.

In English, you must choose between person and people.
In Korean, 사람 can refer to a person or people, depending on the sentence.

Since 많다 already means to be many, the plural idea is clear:

• 사람이 많아요 = there are many people

You could say 사람들이 많아요, but it is often less natural or simply unnecessary here.

Here, -겠- expresses the speaker’s guess, assumption, or inference.

So 많겠어요 means something like:

• there are probably many people
• I suppose there are many people
• it must be crowded
• there will probably be many people

In this sentence, the speaker is reasoning from the situation:

• It’s lunchtime now, so there are probably many people in the restaurant.

So -겠어요 is not just plain future tense here. It shows a judgment or guess.

Not really, or at least not mainly.

Although -겠- can sometimes look like future in English translations, here it is better understood as supposition or inference.

Because of 지금은 and 점심시간이라서, the meaning is basically about the current situation:

• Since it’s lunchtime now, there are probably many people in the restaurant.

English may translate it with will, but the Korean feeling is closer to:

• must be
• is probably
• I bet there are

The difference is certainty.

• 많아요 = There are many people.
  
  • This sounds like a direct statement of fact.
• 많겠어요 = There are probably many people.
  
  • This sounds like the speaker is guessing or inferring.

So:

• 식당에 사람이 많아요 = There are many people in the restaurant.
• 식당에 사람이 많겠어요 = There are probably many people in the restaurant.

If the speaker has not actually checked and is just reasoning from lunchtime, 많겠어요 is very natural.

Both can express probability, but the nuance is a little different.

• 많겠어요 often sounds like an immediate inference or speaker’s judgment
• 많을 거예요 often sounds like a prediction or expectation

In this sentence, 많겠어요 fits well because the speaker is thinking:

• It’s lunchtime now, so I’m guessing the restaurant is crowded.

If you said 많을 거예요, it would still be natural, but it can sound a little more like a general prediction.

It is in the polite -어요 style.

• 많겠어요 is polite
• the whole sentence is appropriate for everyday polite conversation

It is not the most formal style. A more formal version might be:

• 지금은 점심시간이라서 식당에 사람이 많겠습니다.

A more casual version between close friends could be:

• 지금 점심시간이라서 식당에 사람 많겠다.

식당 can mean several things depending on context:

• restaurant
• cafeteria
• dining hall
• canteen

So the exact English translation depends on the situation.

For example:

• at school or work, 식당 may mean cafeteria
• in general city life, it may mean restaurant

The Korean sentence itself does not force only one of those meanings.

Yes, you can.

• 점심시간이라서 = because/since it is lunchtime
• 점심시간이니까 = because/since it is lunchtime

Both are natural here.

A rough nuance difference:

• -이라서 / -라서 often sounds like a straightforward explanation of the reason
• -이니까 / -니까 can sound a bit more like the speaker’s reasoning or justification

So both work, but 이라서 is a very smooth, natural choice in this sentence.

The structure is:

• 지금은 = as for now / right now
• 점심시간이라서 = because it is lunchtime
• 식당에 = in the restaurant/cafeteria
• 사람이 = people
• 많겠어요 = are probably many / must be many

A more literal breakdown would be:

• As for now, because it is lunchtime, in the restaurant people are probably many.

That sounds unnatural in English, but it shows how Korean organizes the sentence: time/topic → reason → location → subject → predicate.