Korean · Pronunciation Guide
nop-tta. A rounded ㅗ, an unreleased ㅍ heard only as a silent closure, and a tensed ㄸ.
nopda
Timing rather than volume: the silent lip closure in the middle has to last long enough to be heard as an absence, which is counter-intuitive for English speakers used to releasing every consonant they make.
Listen: 높다
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저 산은 아주 높아요.
Jeo saneun aju nopayo.
That mountain is very high.
Listen: 저 산은 아주 높아요.
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저 산은 아주 높아요 restores the aspiration. With a vowel following, the ㅍ resyllabifies forward and is heard in full, giving no-pa-yo with a genuine puff -- the batchim that was silent becomes the strongest consonant in the word.
Aspirating the batchim gives 'noph-da' with breath in the middle, which final position does not allow, and releasing it at all is wrong, since the closure is the whole signal. Learners also flatten the ㅗ toward 'uh', when it needs real lip rounding to stay distinct from the ㅓ words around it.