hwadaneun jal gwanridoen banmyeon baesugueseoneun akchwiga napnida.

화단 means flower bed or garden bed.

The particle 은 marks it as the topic of the sentence. In this sentence, it also helps create a contrast with the second part:

• 화단은 = as for the flower bed...
• later, 배수구에서는 = in the drain, on the other hand...

So 은 is not just marking the topic; it also helps set up the idea of comparison/contrast.

Here 잘 means well or properly.

It modifies 관리된 and tells you that the flower bed has been maintained well:

• 잘 관리된 = well-maintained

This is a very common use of 잘 with verbs and verb-based descriptions.

관리된 comes from the verb 관리되다, which means to be managed or to be maintained.

Breakdown:

• 관리하다 = to manage / maintain
• 관리되다 = to be managed / be maintained
• 관리된 = the form used before a noun-like element, often translated as that has been maintained or simply maintained

So:

• 잘 관리된 = well maintained

In English, this often sounds like an adjective, but in Korean it comes from a verb form.

Because the sentence focuses on the flower bed being in a maintained state, not on the person doing the maintaining.

• 관리한 would come from 관리하다 and would suggest someone managed it
• 관리된 comes from 관리되다 and describes it as having been maintained

Korean often uses this kind of passive-style form when describing the condition of something:

• 잘 관리된 화단 = a well-maintained flower bed

This is very natural in Korean.

That is a great question. In this sentence, 관리된 is not hanging by itself. It is attached to 반면 in the grammar pattern A-(으)ㄴ/는 반면 B.

So the structure is:

• 잘 관리된 반면 = whereas it is well maintained / while it is well maintained

Here, 반면 works like a bound noun meaning something like side or aspect, and the form before it must modify it.

So 관리된 is doing exactly what it should do: it is modifying 반면.

반면 means whereas, while, or on the other hand.

It is used to show a clear contrast between two situations:

• 화단은 잘 관리된 반면 = whereas the flower bed is well maintained
• 배수구에서는 악취가 납니다 = there is a bad smell from the drain

So the whole sentence contrasts:

• a nicely maintained flower bed
• a smelly drain

This is stronger and more formal than a simple but in many cases.

Both can express contrast, but 반면 often sounds more like by contrast or whereas, and it tends to highlight a comparison between two sides more explicitly.

Compare:

• 화단은 잘 관리됐지만 배수구에서는 악취가 납니다.
  = The flower bed is well maintained, but there is a bad smell from the drain.

• 화단은 잘 관리된 반면 배수구에서는 악취가 납니다.
  = The flower bed is well maintained, whereas the drain smells bad.

So 반면 feels more like a deliberate side-by-side contrast.

Because it combines:

• 에서 = location where something happens / source location
• 는 = topic or contrast marker

So 배수구에서는 means something like:

• in the drain
• as for the drain
• from the drain, on the other hand

The 는 adds contrast with the earlier 화단은.

Without 는, 배수구에서 would just state the location more neutrally.
With 는, it sounds more like:

• the flower bed is fine, but in the drain...

The expression 악취가 나다 is a very common Korean pattern meaning:

• a bad smell comes out
• there is a stench
• it smells bad

Here:

• 악취 = foul odor / stench
• 가 marks 악취 as the subject
• 나다 literally means to come out, to arise, or to occur

So 악취가 납니다 literally means something like:

• a foul smell is arising
• a stench is coming out

This is why 를 is not used: 나다 is not acting like a transitive verb here.

냄새 is the general word for smell/odor. It can be neutral, good, or bad depending on context.

악취 specifically means:

• bad smell
• foul odor
• stench

So 악취가 납니다 is much stronger and more negative than 냄새가 납니다.

This choice of word makes the contrast sharper:

• the flower bed is well maintained
• but the drain gives off a stench

Yes. That is a natural English rendering.

Depending on context, you could translate it as:

• Although the flower bed is well maintained, there is a bad smell coming from the drain.
• The flower bed is well maintained, whereas the drain gives off a foul odor.
• The flower bed is well kept, but the drain smells bad.

The exact English wording may change, but the Korean structure is mainly expressing a contrast between two conditions.