gongwoneseo cheoncheonhi georeumyeon ma-eumi pyeonhaejyeoyo.

공원에서 means in the park or at the park.

The particle -에서 is used for the place where an action happens. Since 걷다 means to walk, and walking is an action, -에서 is the natural choice.

• 공원에서 걷다 = to walk in the park
• 학교에서 공부하다 = to study at school

A common learner question is why not 공원에.

• -에 often marks a destination or location of existence.
• -에서 marks the location where an activity takes place.

So in this sentence, 공원에서 is correct because the speaker is walking there.

천천히 means slowly.

It is an adverb, so it describes how the action is done. Here, it describes how someone walks:

• 천천히 걸어요 = walk slowly

English learners often want to match word types:

• 천천한 = slow (as a descriptive form before a noun, though this is less common in everyday speech)
• 천천히 = slowly

So in this sentence, 천천히 tells us the manner of walking.

걸으면 comes from 걷다 (to walk) + -(으)면.

So 걸으면 means:

• if (someone) walks
• when (someone) walks

In many sentences like this, -(으)면 can sound like a general truth or repeated situation, not just a one-time hypothetical. So here it can be understood as:

• If I walk slowly in the park, I feel calmer
• When I walk slowly in the park, my mind feels at ease

The exact English translation depends on context, but the grammar is the same.

-(으)면 is a grammar pattern meaning if or when.

How it attaches:

• after a consonant: -으면
• after a vowel: -면

Examples:

• 먹다 → 먹으면 = if/when (someone) eats
• 가다 → 가면 = if/when (someone) goes
• 걷다 → 걸으면 = if/when (someone) walks

Notice that 걷다 is an irregular verb:

• 걷다 does not become 걷으면
• it becomes 걸으면

That is because ㄷ changes to ㄹ before a vowel in certain forms.

This is because 마음 is the thing that becomes relaxed, so it is treated as the subject of 편해져요.

• 마음이 편해져요 = the mind/heart becomes at ease

Here:

• 이/가 marks the subject
• 을/를 would mark a direct object

Since 편해지다 means to become comfortable / to become relaxed, it does not take 마음을 as a direct object here. The sentence is not saying I relax my mind. It is saying my mind becomes relaxed.

마음 can mean several related things in Korean:

• heart
• mind
• feelings
• state of mind

In this sentence, 마음이 편해져요 means something like:

• my mind feels at ease
• I feel emotionally relaxed
• my heart feels lighter

So 마음 is broader than just the English word heart. It often refers to someone's inner feelings or emotional state.

편해져요 comes from:

• 편하다 = to be comfortable, at ease, relaxed
• -아/어지다 = to become

So:

• 편하다 = to be comfortable / relaxed
• 편해지다 = to become comfortable / relaxed
• 편해져요 = polite present form of 편해지다

Literally, 마음이 편해져요 means:

• the mind becomes relaxed
• I start to feel at ease

This is slightly different from simply saying 편해요, which would mean is comfortable/relaxed rather than becomes relaxed.

The difference is about change of state.

• 편해요 = is relaxed / feels relaxed
• 편해져요 = becomes relaxed / starts to feel relaxed

In this sentence, the idea is that walking slowly in the park causes a change:

• before walking: maybe stressed or tense
• after/during walking: the mind becomes calmer

So 편해져요 fits very naturally because it emphasizes that change.

Korean often leaves out subjects when they are understood from context.

In this sentence, there is no explicit 저는 or 제가, but the meaning is often understood as something like:

• When I walk slowly in the park, I feel at ease
• If you walk slowly in the park, your mind becomes relaxed
• When one walks slowly in the park, the mind becomes relaxed

Without more context, it can sound general or personal. Korean does this very often, and learners need to get used to subjects being omitted.

The sentence structure is:

• 공원에서 = in the park
• 천천히 = slowly
• 걸으면 = if/when (someone) walks
• 마음이 편해져요 = the mind becomes relaxed

So the first part sets up the condition, and the second part gives the result.

A very natural breakdown is:

• 공원에서 천천히 걸으면 = if/when you walk slowly in the park
• 마음이 편해져요 = your mind feels at ease

Korean word order is more flexible than English, but not completely free. Adverbs and place phrases can often move around, but this version is very natural and clear.

For example, you might also hear:

• 공원에서 걸으면 마음이 편해져요
• 천천히 걸으면 마음이 편해져요

But the original sentence sounds smooth and natural.

This is because 걷다 is a ㄷ irregular verb.

For some Korean verbs ending in ㄷ, the ㄷ changes to ㄹ when a vowel follows.

So:

• 걷다
  • -으면
• not 걷으면
• but 걸으면

Other examples:

• 듣다 → 들으면 = if/when (someone) listens
• 묻다 → 물으면 = if/when (someone) asks

This is something learners often need to memorize verb by verb, because not every ㄷ verb is irregular.

편해져요 is in the polite standard style, often called -요 form.

That means it is:

• polite
• natural in everyday conversation
• not overly formal

Compare:

• 편해져요 = polite everyday speech
• 편해집니다 = more formal
• 편해져 = casual, intimate speech

So the whole sentence sounds like a normal polite statement you might say in conversation.