안
an
Where exactly is the room inside "within a week"?
The picture Draw a boundary line, then point only at what falls inside it. Whatever is outside the line is not the subject.
Where the picture shows up in 안
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inside an object's boundary
가방 안에 있어요.
ga-bang a-ne i-sseo-yo
It's in the bag.
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inside a building's boundary
추우니까 안으로 들어오세요.
chu-u-ni-kka a-neu-ro deu-reo-o-se-yo
It's cold — come inside.
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inside a boundary drawn on time
일주일 안에 끝내야 해요.
il-ju-il a-ne kkeun-nae-ya hae-yo
It has to be done within the week.
The same line gets drawn on time, and 안 points inside it.
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inside a boundary drawn on a limit
예산 안에서 해결했어요.
ye-san a-ne-seo hae-gyeol-hae-sseo-yo
We handled it without going over budget.
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inside a person's boundary
겉으로만 웃고 안으로는 힘들었어요.
geo-teu-ro-man ut-kko a-neu-ro-neun him-deu-reo-sseo-yo
I smiled on the outside, but inside it was hard.
Korean likes to set 겉 (outside) against 안 (inside) in one breath.