mudae ap gwangaegi hwanhohago baksuchyeosseo.

It means the audience in front of the stage or the audience near the front of the stage.

This is a noun phrase built like this:

• 무대 = stage
• 앞 = front
• 관객 = audience / spectators

So 무대 앞 관객 literally means stage-front audience. In natural English, that usually comes out as the audience in front of the stage or the audience at the front, near the stage.

Depending on context, it can refer either to:

• the audience located in front of the stage in general, or
• the audience members closest to the stage

Because 앞 is being used as a noun meaning front, and 무대 앞 works as a set phrase meaning the front of the stage.

So this is not missing anything unusual. Korean often makes noun phrases like this:

• 학교 앞 = in front of the school
• 집 앞 = in front of the house
• 무대 앞 = in front of the stage

You could also say 무대 앞의 관객 with 의, which makes the relationship more explicit:

• 무대 앞 관객 = the audience in front of the stage
• 무대 앞의 관객 = the audience that is in front of the stage

Both are natural, but Korean often drops 의 when the meaning is clear.

이/가 is the subject marker, while 은/는 is the topic marker.

Here, 관객이 simply marks the audience as the subject of the verbs:

• 관객이 환호하고 박수쳤어 = the audience cheered and clapped

If you changed it to 관객은, the sentence would feel more like you are setting up the audience as a topic, often with some contrast or background sense:

• 관객은 환호하고 박수쳤어 = as for the audience, they cheered and clapped

So 관객이 is a straightforward way to say who did the action.

No. 관객 can refer to the audience as a group, not just one person.

In Korean, plural marking is often optional when the meaning is clear. A noun without 들 can still be plural or collective depending on context.

So here:

• 관객이 = the audience / the audience members

If you said 관객들이, that would emphasize the individual audience members more:

• 관객들이 환호하고 박수쳤어 = the audience members cheered and clapped

Both can work, but 관객이 is very natural because audience is commonly treated as a group noun.

The ending -고 connects verbs and usually means and.

So:

• 환호하고 = cheered, and...
• 박수쳤어 = clapped

Together:

• 환호하고 박수쳤어 = cheered and clapped

A useful point: both actions share the same subject, which is 관객이.

In this sentence, -고 is just linking two actions in a simple, natural way. It does not necessarily strongly emphasize order; it just presents both actions together.

Yes. In Korean, when verbs are linked with -고, the tense is often shown only on the final verb, and that tense applies to the whole connected action.

So:

• 환호하고 박수쳤어

means that both actions happened in the past:

• cheered and clapped

Even though 환호하고 does not visibly show past tense by itself, it is understood as past because the final verb 박수쳤어 is in the past.

You may also sometimes see:

• 환호했고 박수쳤어

That makes the first verb explicitly past too, but in many everyday sentences, marking the final verb is enough.

Because the natural verb for to clap in Korean is 박수치다, not usually 박수하다.

Breakdown:

• 박수 = applause / clapping
• 치다 = to hit, strike, do certain actions

Together, 박수치다 is the standard expression meaning to clap.

Conjugation:

• 박수치다 → 박수쳤어

So this is the normal everyday form.

Yes. Both are natural.

• 박수쳤어
• 박수를 쳤어

They both mean clapped.

Why are both possible?

Because 박수치다 can behave like:

• a single lexical verb, or
• a noun + object marker + verb structure

So you may see either:

• 박수치다
• 박수를 치다

In everyday speech, 박수쳤어 is very common and compact.

Yes. 환호 is a noun meaning cheer or cheering, and the full verb is 환호하다 = to cheer.

So:

• 환호하다 = to cheer
• 환호하고 = cheering and... / cheered and...

This is a very common Korean pattern:

• noun + 하다 = verb

Other examples:

• 공부하다 = to study
• 운동하다 = to exercise
• 환호하다 = to cheer

So 환호하고 is just the -고 form of 환호하다.

-었어 / -았어 / -했어 is the casual informal speech style.

So 박수쳤어 is something you would use:

• with friends
• with younger people
• in diary-style writing
• in casual storytelling

To make it polite, you would say:

• 무대 앞 관객이 환호하고 박수쳤어요.

To make it more formal:

• 무대 앞 관객이 환호하고 박수쳤습니다.

So the original sentence is natural, but it is not polite speech.

Yes, absolutely.

• 무대 앞 관객이 환호하고 박수쳤어
• 무대 앞의 관객이 환호하고 박수쳤어

Both are grammatical and natural.

The version with 의 is a little more explicit, because it clearly marks 무대 앞 as describing 관객.

The version without 의 is shorter and very common in Korean, especially when the relationship is obvious from context.