juyeon bae-uga daesareul modu oewosseo.

주연 means leading role or starring role, so 주연 배우 means the lead actor / the starring actor.

• 배우 = actor
• 주연 배우 = lead actor

So this sentence is not talking about just any actor, but specifically the main one.

Also, 주연 is functioning like a noun that describes another noun, which is very common in Korean:

• 주연 배우 = lead actor
• 조연 배우 = supporting actor

가 is the subject particle, so 배우가 marks the lead actor as the subject of the sentence.

In a simple sentence like this, 가 often just presents the subject neutrally:

• 주연 배우가 대사를 모두 외웠어. = The lead actor memorized all the lines.

If you used 는 instead, it would often add a contrastive or topical feeling:

• 주연 배우는 대사를 모두 외웠어. = As for the lead actor, he/she memorized all the lines.

That version might suggest contrast, like maybe someone else did not memorize theirs. So 가 is the more neutral choice here.

대사 means lines or dialogue in the sense of an actor’s spoken lines.

The 를 is the object particle. It marks 대사 as the thing being memorized.

So:

• 대사 = lines / dialogue
• 대사를 = the lines (as the object of the verb)

In Korean, the object particle is:

• 을 after a consonant
• 를 after a vowel

Since 대사 ends in the vowel ㅏ, it becomes 대사를.

모두 means all or entirely here.

So 대사를 모두 외웠어 means:

• memorized all the lines

In Korean, adverbs like 모두 are fairly flexible, but they are often placed before the verb or after the object, as in this sentence.

Common possibilities:

• 대사를 모두 외웠어
• 모두 대사를 외웠어

Both are natural, though the first one is very common.

Here, 모두 is emphasizing that none of the lines were left unmemorized.

외웠어 comes from the dictionary form 외우다, which means to memorize.

It is the:

• past tense
• informal/casual style

Formation:

• 외우다
• stem: 외우-
• past tense with -었-
• contraction: 외우었어 → 외웠어

This kind of contraction is normal in Korean.

So:

• 외우다 = to memorize
• 외워 = memorize / memorizes (casual non-past)
• 외웠어 = memorized (casual past)

Because Korean very often contracts forms that would otherwise sound long or unnatural.

With 외우다:

• underlying form: 외우었어
• natural contracted form: 외웠어

This is just the normal spoken and written form in everyday Korean.

You will see this with many verbs:

• 배우다 → 배웠어
• 세우다 → 세웠어
• 외우다 → 외웠어

So 외우었어 is not the form you would normally use in real speech.

외웠어 is casual/informal speech.

You would use it with:

• close friends
• younger people
• family
• people you speak casually with

Politer versions would be:

• 외웠어요 = polite
• 외웠습니다 = formal

So the same sentence can become:

• 주연 배우가 대사를 모두 외웠어요.
• 주연 배우가 대사를 모두 외웠습니다.

The core meaning stays the same; only the speech level changes.

Not exactly.

외우다 means to memorize, learn by heart, or commit to memory. It focuses on the process or result of memorizing something intentionally.

remember in English is often closer to 기억하다 in Korean.

Compare:

• 대사를 외웠어 = memorized the lines
• 대사를 기억했어 = remembered the lines

So in this sentence, 외웠어 suggests the actor studied the lines and got them memorized, not just that they happened to remember them.

Yes, 주연 배우 as two words is the standard spacing.

In Korean, noun + noun combinations are often written with a space:

• 주연 배우
• 영화 배우
• 아역 배우

Sometimes you may see compounds written together in less careful writing or in certain contexts, but for standard spacing, 주연 배우 is the safer and more correct choice.

So for a learner, it is best to write:

• 주연 배우가 대사를 모두 외웠어.

It is pronounced roughly like oe-wo-sseo, though actual Korean pronunciation is smoother than that.

A helpful breakdown:

• 외 is often pronounced close to 웨 by many speakers in modern Korean
• 웠 sounds like 워t with the final consonant unreleased
• 어 in -었어 becomes part of the spoken ending

So 외웠어 is commonly heard approximately as:

• 왜웠어 or 웨웠어 in practical listening terms

For many learners, the important thing is recognizing that the written form 외웠어 may sound a bit different from how they expect from spelling alone.

Yes, Korean often drops particles in casual speech when the meaning is clear.

For example, in conversation, someone might say:

• 주연 배우 대사 모두 외웠어.

But the full textbook-style version is:

• 주연 배우가 대사를 모두 외웠어.

For learners, it is better to understand and practice the full version first, because it clearly shows:

• 가 for the subject
• 를 for the object

Later, you will get used to hearing particles omitted in natural speech.