kapee deureogajamaja koteureul uija-e georeo dwosseo.

-자마자 means as soon as or right after doing something.

So 들어가자마자 means as soon as I entered / right after entering.

• 들어가다 = to go in, to enter
• 들어가자마자 = as soon as (someone) entered

It emphasizes that the second action happened immediately after the first one.

Both 들어가다 and 들어오다 can relate to entering, but they depend on viewpoint.

• 들어가다 = to go in
• 들어오다 = to come in

In this sentence, the speaker is describing going into the café from their own perspective as an action, so 들어가자마자 is very natural.

If the speaker were focusing on movement toward the speaker’s current location, 들어오다 might be possible in another context. But for entering a place like a café, 들어가다 is extremely common.

Yes, they are different in function, even though the same particle 에 is used.

1. 카페에

Here 에 marks the destination or location entered into.

• 카페에 들어가다 = to go into the café

2. 의자에

Here 에 marks the place where something is attached, placed, or hung.

• 코트를 의자에 걸다 = to hang the coat on the chair

So in this sentence:

• 카페에 = into the café
• 의자에 = on the chair

Same particle, different nuance depending on the verb.

Because 코트 is the direct object of 걸어 뒀어.

• 코트를 걸다 = to hang the coat

So:

• 코트 = the thing being hung
• 의자에 = the place where it is hung

This pattern is very common:

• 책을 책상에 놓다 = put the book on the desk
• 가방을 의자에 두다 = place the bag on the chair
• 코트를 의자에 걸다 = hang the coat on the chair

걸어 뒀어 comes from 걸어 두었어, often shortened in speech to 걸어 뒀어.

It means something like:

• hung it up and left it there
• put it hanging
• hung it in advance / for the time being

The important idea is not just the act of hanging, but the resulting state being kept.

Compare:

• 코트를 의자에 걸었어 = I hung the coat on the chair.
• 코트를 의자에 걸어 뒀어 = I hung the coat on the chair and left it there.

So -아/어 두다 often adds the sense of:

• doing something beforehand
• leaving something in a certain state
• doing something for convenience or preparation

-아/어 두다 means to do something and leave it that way, or to do something in advance.

In this sentence:

• 걸다 = to hang
• 걸어 두다 = to hang something and leave it there

This grammar is very common in everyday Korean.

Examples:

• 문을 열어 뒀어. = I left the door open.
• 음식을 만들어 뒀어. = I prepared the food in advance.
• 가방을 여기 놔뒀어. = I left the bag here.

So here, the speaker is not only saying they hung the coat, but also that it remained hanging on the chair.

뒀어 is a contracted form of 두었어.

• 두었어 → 뒀어

This contraction is very common in spoken Korean and informal writing.

Other similar contractions:

• 놓았어 → 놨어
• 보았어 → 봤어
• 주었어 → 줬어

So 걸어 뒀어 is just a natural, everyday way of saying 걸어 두었어.

Yes. 뒀어 ends in the informal, casual speech style.

This style is used:

• with friends
• with people younger than you
• in casual conversation
• in diary-like narration

A more polite version would be:

• 카페에 들어가자마자 코트를 의자에 걸어 뒀어요.

A more formal/written style could be:

• 카페에 들어가자마자 코트를 의자에 걸어 두었다.

So the original sentence sounds natural and conversational.

The subject is omitted because Korean often leaves out subjects when they are understood from context.

In English, you usually need to say I, he, she, etc. But in Korean, if it is obvious, you can simply omit it.

So this sentence naturally implies something like:

• (나는) 카페에 들어가자마자 코트를 의자에 걸어 뒀어.
• (I) hung my coat on the chair as soon as I entered the café.

Leaving out the subject makes the sentence sound more natural in many situations.

Yes, it very likely means my coat in context, even though 내 is not stated.

Korean often omits possessives like my, your, or his/her when the meaning is obvious.

So:

• 코트를 의자에 걸어 뒀어 naturally means I hung my coat on the chair

If you said 내 코트, it would add emphasis or contrast, but it is often unnecessary.

Compare:

• 코트를 걸어 뒀어. = I hung up the coat. / I hung up my coat.
• 내 코트를 걸어 뒀어. = I hung up my coat.
  (more explicit, possibly contrastive)

Yes, 걸어 놨어 is also possible, and it is very common.

Difference:

• -아/어 두다 often emphasizes doing something and leaving it in that state, sometimes with a sense of preparation.
• -아/어 놓다 is very similar and often overlaps in meaning, especially in conversation.

So:

• 코트를 의자에 걸어 뒀어
• 코트를 의자에 걸어 놨어

Both can mean I hung the coat on the chair and left it there.

In many real-life situations, the difference is small. Learners should mainly recognize that both express a completed action with a continuing result.

It suggests both:

1. The action happened in the past.
2. The coat was left in that state afterward.

That is because 걸어 뒀어 combines:

• a past event
• a resulting state

So the focus is not only I hung it, but also I left it hanging there.

Depending on context, it may imply that the coat was still on the chair at that relevant time, though not always with strict certainty. The main point is the result of the action.

A helpful breakdown is:

• 카페에 들어가자마자 = as soon as I went into the café
• 코트를 = the coat
• 의자에 = on the chair
• 걸어 뒀어 = hung it up and left it there

So the sentence structure is roughly:

As soon as I entered the café, I hung my coat on the chair and left it there.

That kind of breakdown helps show why Korean uses -자마자 and -아/어 두다 here.