oneureun barami chagawoseo jaekis hana deo gajyeowasseo.

Today the wind is cold, so I brought one more jacket.

Breakdown of oneureun barami chagawoseo jaekis hana deo gajyeowasseo.

• ~이: subject particle
• ~은: topic particle
• 오늘: today
• 하나: one

Questions & Answers about oneureun barami chagawoseo jaekis hana deo gajyeowasseo.

Why is it 오늘은 and not 오늘이?

은/는 marks the topic, so 오늘은 means something like as for today or today, at least.

In this sentence, 오늘은 sets the scene:

• 오늘은 = as for today / today
• then the speaker comments on today’s condition

If you said 오늘이, it would sound like today is the grammatical subject in a different kind of sentence, which does not fit as naturally here.

So:

• 오늘은 바람이 차가워서... = As for today, the wind is cold, so...

This is a very common Korean pattern: use 은/는 to introduce the time or topic, then describe what is happening.

Why does 바람 take 이 in 바람이 차가워서?

Here, 바람이 is the subject of 차갑다 (to be cold).

So:

• 바람이 차갑다 = The wind is cold

The wind is the thing that has the property of being cold, so it gets the subject marker 이/가.

This creates a nice structure:

• 오늘은 = topic/time frame
• 바람이 = subject inside that frame

A very literal breakdown is:

• Today, as for it, the wind is cold, so...