Korean · Pronunciation Guide
ha-na, two open syllables of pure 'ah'. Easy to say, easy to get lazy about -- both vowels must stay wide.
hana
Two even beats. This is a native Korean numeral rather than a Sino-Korean one, so it pairs with native counters -- and it clips to 한 in front of a counter, which is worth knowing because the pronunciation changes shape completely the moment you actually count something.
Listen: 하나
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가방이 하나 있어요.
Gabangi hana isseoyo.
I have one bag.
Listen: 가방이 하나 있어요.
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가방이 하나 있어요 uses 하나 in its standalone counting role, and 있어요 right after it resyllabifies, moving the ㅆ of 있 into 어 to surface as a full double s: i-sseo-yo. The 가방이 at the front does something similar with its ㅇ, holding the ng and carrying it into the particle.
The main error is importing English vowel reduction and saying 'HUH-nuh'. Korean unstressed vowels do not become schwa; both syllables keep a full open ㅏ. A secondary problem is over-aspirating the ㅎ, which in Korean is gentler than its English counterpart -- a forceful h makes the word sound barked.