ojik juyeonman daesareul malhae.

Yes. They both add the idea of only, but they do it in different ways:

• 오직 is an adverb meaning solely / only / exclusively
• 만 is a particle attached to a noun, here 주연만 = only the lead

Using both together gives extra emphasis, something like:

• only the lead
• the lead alone
• none but the lead

So 오직 주연만 is stronger than just 주연만. In everyday speech, people often drop 오직 and simply say 주연만 대사를 말해.

주연 usually means the lead role or the lead actor/actress, depending on context.

So in this sentence, it could refer to:

• the person in the leading role
• the main role itself, understood as the one performing the action

In natural English, you would usually translate it as the lead or the main actor/actress.

A useful contrast:

• 주연 = lead
• 조연 = supporting role / supporting actor

That is a very common learner question.

In Korean, particles are often omitted, especially in casual speech. So 주연만 can appear without an extra subject marker even though it is functioning as the subject.

Possible versions:

• 오직 주연만 대사를 말해
• 오직 주연만이 대사를 말해

Both are possible. The version with 만이 makes the subject role more explicit and can sound a bit more marked or emphatic.

So the sentence without 이/가 is not wrong; it is just a natural omission.

대사 means lines or dialogue, especially in a script, play, movie, or drama.

The -를 is the object particle:

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

So:

• 대사를 말해 = say the lines

This is different from general speech:

• 말 = words / speech in a broad sense
• 대사 = scripted dialogue / lines

Yes, you can. 대사를 말하다 is understandable and grammatical.

It means literally to say the lines or to speak the dialogue.

Depending on context, Korean may also use other verbs, such as:

• 대사를 하다 = to do/deliver lines
• 대사를 치다 = to deliver lines, often with a theatrical or performance-related feel

So 대사를 말해 is not strange. It is a straightforward way to express that someone is saying scripted lines.

말해 is the casual, non-polite 해체 form.

Compare:

• 말해 = casual
• 말해요 = polite
• 말합니다 = formal
• 말한다 = plain written / dictionary-style narrative

So this sentence sounds casual, like something you might say to a friend, in informal narration, or in simple example sentences.

Yes. By itself, 말해 can be interpreted as either:

• a casual statement: (someone) says / is saying
• a casual command: say (it)! / speak!

Korean often relies on context and intonation to distinguish these.

So this sentence could be understood differently depending on the situation:

• Only the lead says the lines.
• Only the lead should say the lines.

If your learning material already gives one meaning, follow that meaning, but it is good to know the form itself can be ambiguous without context.

Here, only applies to 주연 because of 주연만.

So the meaning is:

• Only the lead says the lines
• No one except the lead says the lines

It does not mean:

• The lead only says lines
  (as in, the lead does nothing except say lines)

If you wanted that meaning, Korean would place 만 differently, for example:

• 주연은 대사만 말해
  = The lead only says lines

So the position of 만 matters a lot.

Not completely. Korean word order is more flexible than English, as long as the verb stays at the end.

The basic order here is:

• 오직
  • 주연만
    • 대사를
      • 말해

That is a very normal structure:

• adverb + subject/topic-like phrase + object + verb

You could rearrange parts to change emphasis, for example:

• 대사는 오직 주연만 말해

That puts more focus on 대사.

So the sentence order is natural, but not the only possible order.

It is natural, but it sounds a bit more emphatic or literary than plain everyday speech.

In casual conversation, many speakers would simply say:

• 주연만 대사를 말해

Adding 오직 makes it feel stronger, like:

• solely the lead
• the lead alone
• nothing but the lead

So 오직 is not wrong at all, but it can sound more deliberate, dramatic, or written than just using 만 alone.