chinguga gyeolmareul malhaeseo yeonghwareul bogi jeone ara beoryeosseoyo.

It breaks down like this:

• 친구가 = my friend
  • subject marker
• 결말을 = the ending
  • object marker
• 말해서 = because (someone) said/told it
• 영화를 보기 전에 = before watching the movie
• 알아 버렸어요 = I ended up finding out

So the sentence is basically:

Because my friend told me the ending, I found out before watching the movie.

The subject of 알아 버렸어요 is not stated, but it is understood as I from context.

가 marks 친구 as the subject of the first clause: the friend is the one who did the telling.

• 친구가 결말을 말해서 = my friend told the ending / because my friend said the ending

If you used 친구는, it would sound more like setting up as for my friend..., often with contrast or topic emphasis. In this sentence, 가 is the most natural choice because it simply identifies who performed the action.

Because 결말 is the object of 말하다 here.

• 결말을 말하다 = to say/tell the ending

So:

• 친구가 = subject
• 결말을 = object

A very literal reading is My friend said the ending. In natural English, we usually say My friend told me the ending or My friend spoiled the ending.

말해서 is from 말하다 + -아서/어서.

Here, -아서/어서 connects two actions and gives a cause/reason meaning:

• 결말을 말해서 = because (someone) told the ending
• more naturally: because my friend told me the ending

So the sentence means that the second event happened as a result of the first one.

It can often sound like and so in English:

• My friend told me the ending, so I found out before watching the movie.

Because 전(에) normally attaches to a noun-like form, not directly to the plain dictionary form of the verb.

So 보다 becomes 보기:

• 보다 = to watch
• 보기 = watching / the act of watching

Then:

• 영화를 보기 전에 = before watching the movie

This is a very common pattern:

• 먹기 전에 = before eating
• 자기 전에 = before sleeping
• 가기 전에 = before going

-기 전에 means before doing something.

So:

• 영화를 보기 전에 = before watching the movie

This tells you the timing of the action 알아 버렸어요:

• I found out before I watched the movie.

It does not mean the person was in the middle of watching. It specifically means the information was learned earlier than the movie-viewing.

This is one of the most important nuance points in the sentence.

• 알았어요 = I knew / I found out
• 알아 버렸어요 = I ended up finding out / I found out unfortunately / completely

The grammar -아/어 버리다 often adds one of these feelings:

1. completion: the action is fully done
2. regret / annoyance / undesired result: something happened and the speaker is unhappy about it

In this sentence, it strongly suggests an unwanted result:

• I ended up finding out the ending before seeing the movie.
• In natural English: The ending got spoiled for me before I watched the movie.

So 버렸어요 gives the sentence a disappointed or frustrated tone.

Both are possible, but they feel different.

• 알게 되었어요 = I came to know / I found out

  • more neutral
  • focuses on the change of state

• 알아 버렸어요 = I ended up finding out

  • often sounds more emotional
  • can imply regret, annoyance, or that it happened against the speaker’s wishes

So in a spoiler situation, 알아 버렸어요 feels especially natural because it captures the feeling of Oh no, now I know the ending.

The subject is omitted because Korean often leaves out things that are obvious from context.

In this sentence:

• 친구가 is the subject of 말해서
• the subject of 알아 버렸어요 is understood to be I

So the full meaning is:

• My friend told me the ending, so I ended up finding out before watching the movie.

Korean frequently drops 저는 / 내가 when it is already clear.

Here it means to find out / come to know, not just to know as a general state.

That is because the sentence is about a change:

• before: I did not know the ending
• after my friend told me: I knew it

So 알아 버렸어요 is best understood as:

• I found out
• I ended up learning
• I came to know

not simply I knew in the usual general sense.

Not literally. 말하다 just means to say / tell.

But in context:

• 친구가 결말을 말해서 = because my friend told me the ending

Since telling someone the ending before they watch the movie is a spoiler, the whole sentence naturally implies that the friend spoiled it.

So Korean does not have to use a special verb here. The spoiler meaning comes from context.

Korean often puts the reason/background first and the main result later.

So:

• 친구가 결말을 말해서 = reason
• 영화를 보기 전에 알아 버렸어요 = result

This is very natural in Korean. It leads the listener through the logic step by step:

1. My friend told me the ending
2. so I ended up finding out before watching the movie

English can do the same thing, but Korean uses this pattern very frequently.

Yes, depending on how natural you want the English to sound.

A more literal translation is:

• Because my friend told me the ending, I found out before watching the movie.

A more natural English translation is:

• My friend told me the ending, so I found out before watching the movie.

A very natural, less literal translation is:

• My friend spoiled the ending before I watched the movie.
• My friend spoiled the movie for me before I got to watch it.

The Korean sentence itself does not explicitly say for me, but that meaning is understood from context.