seodureudaga mune meorireul budithyeosseoyo.

Here -다가 means while doing something / in the middle of doing something, something else happened.

So 서두르다가 means:

• while hurrying
• when I was hurrying
• as I was in a hurry

It often suggests that the second event interrupts the first one, and very often the second event is unexpected or accidental. That fits this sentence well: the person was hurrying, and then accidentally hit their head on the door.

Both can connect two actions, but the nuance is different.

• 서두르다가 = while hurrying, then something happened
• 서둘러서 = because I hurried / I hurried and then...

In this sentence, -다가 is better because it highlights that the speaker was in the middle of hurrying when the accident happened.

Compare:

• 서두르다가 문에 머리를 부딪혔어요.
  I was hurrying and hit my head on the door.
  → sounds like an accident that happened during the action

• 서둘러서 문에 머리를 부딪혔어요.
  I hurried, so I hit my head on the door.
  → more like cause-and-result

Both are understandable, but -다가 sounds especially natural for this kind of accidental event.

Because 에 marks the place or target that something comes into contact with.

In the pattern:

• A에 B를 부딪히다

it means:

• to bump/hit B against A

So here:

• 문에 = against the door / on the door
• 머리를 = the head

Korean often uses 에 for the thing you run into, bump into, or make contact with.

So 문에 머리를 부딪혔어요 is literally something like:

• I bumped my head against the door.

Because 머리 is the thing that got bumped, so it is treated as the object of the verb.

In this pattern:

• 문에 머리를 부딪히다
• 벽에 팔을 부딪히다
• 책상에 무릎을 부딪히다

the body part usually takes 를/을.

So:

• 문에 = the thing you hit
• 머리를 = the body part that got hit

If you used 머리가, the sentence would be structured differently and would not sound like the normal pattern here.

In Korean, body parts are very often mentioned without words like my, your, or his/her if the owner is obvious from context.

So Korean naturally says:

• 머리를 부딪혔어요
  literally hit the head

but in natural English we say:

• I hit my head

Korean does this a lot with body parts:

• 손을 씻었어요 = I washed my hands
• 눈을 감았어요 = I closed my eyes
• 다리가 아파요 = My leg hurts

So 머리를 is completely natural.

It is 부딪히다.

Here is the breakdown:

• 부딪히다 = dictionary form
• 부딪히 + 었어요
• 부딪혔어요 = past polite form

It means bumped, hit, or ran into depending on context.

In this sentence, it means hit/bumped one’s head against something.

This is a very common question because both are used in similar situations.

In everyday Korean, both can be heard in the general sense of:

• to bump into
• to hit against
• to collide with

For learners, the important thing is that 문에 머리를 부딪혔어요 is a very natural expression.

You may also hear similar expressions with 부딪치다, but in this sentence, just learn this as a common pattern:

• 문에 머리를 부딪히다 = to hit one’s head on the door

If you are still early in learning Korean, it is usually better not to overthink the distinction here.

부딪혔어요 is:

• past tense
• polite speech
• specifically the -어요 style

So it is appropriate for normal conversation when speaking politely.

Compare:

• 부딪혔어요 = polite
• 부딪혔어 = casual/informal
• 부딪혔습니다 = formal polite

So the whole sentence sounds like a normal polite spoken sentence.

Because Korean often leaves out the subject when it is already clear from context.

So even though the sentence does not say I, the meaning can still be:

• I hit my head on the door while hurrying

Korean drops subjects very often, especially in conversation.

You could add one if needed:

• 저는 서두르다가 문에 머리를 부딪혔어요.
• 제가 서두르다가 문에 머리를 부딪혔어요.

But if the speaker is obviously talking about themselves, leaving it out sounds natural.

Yes, very strongly.

Two things help create that feeling:

• 서두르다가 → while hurrying / in the middle of hurrying
• 문에 머리를 부딪혔어요 → hit my head on the door

Together, they naturally suggest an accident that happened because the person was rushing.

So the sentence does not sound deliberate at all. It sounds like:

• I was rushing and accidentally banged my head on the door.

Yes. That is a very natural translation.

Depending on tone, possible English translations include:

• I hit my head on the door while hurrying.
• I banged my head on the door while rushing.
• I was rushing and hit my head on the door.

Since you already know the meaning, the main point is that the Korean sentence has a very natural while doing X, Y happened structure.

Korean word order is more flexible than English, so some reordering is possible. But 문에 머리를 부딪혔어요 is very natural and standard.

That order works well because it presents:

1. the thing you hit against → 문에
2. the body part affected → 머리를
3. the action → 부딪혔어요

A different order might still be understandable, but for learners, 문에 머리를 부딪혔어요 is the safest and most natural pattern to copy.

서두르다 means to hurry, to rush, or to do something in haste.

It often suggests that someone is trying to do something quickly because of time pressure. In a sentence like this, it gives the feeling that the speaker was moving too quickly and that led to the accident.

So in this context:

• 서두르다가 = while rushing / because I was hurrying

It is a very useful everyday verb.

A very useful pattern is:

• V-다가 + accident/unexpected event

For example:

• 뛰다가 넘어졌어요.
  I fell while running.

• 급하게 가다가 지갑을 잃어버렸어요.
  I lost my wallet while going somewhere in a hurry.

• 서두르다가 문에 머리를 부딪혔어요.
  I hit my head on the door while hurrying.

So this sentence is a great example of how Korean uses -다가 to connect an ongoing action with an unexpected result.