Korean · Pronunciation Guide
nah -- one short syllable, the casual counterpart to 저. The vowel is a wide open 'ah', nothing like the flat a of 'nap'.
na
A single beat, and a short one. Because 나 is casual, it usually rides a fast, low-pitched phrase, and stretching it into 'naaah' reads as sarcasm or as a foreign accent rather than as emphasis.
Listen: 나
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나는 음악을 좋아해.
Naneun eumageul joahae.
I like music.
Listen: 나는 음악을 좋아해.
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나는 음악을 좋아해 shows 나 taking the topic particle 는 with no seam, then two resyllabifications in a row: 음악 ends in ㄱ, which hops into 을 to give eu-ma-geul, and 좋아해 loses its ㅎ between vowels, landing as jo-a-hae with that first h barely present.
The trap is the English habit of reducing short function words, saying 'nuh' instead of 'nah'. Korean vowels do not reduce to schwa the way unstressed English vowels do, so 나 keeps its full open quality however fast the sentence runs. Reduce it and you drift toward 너, which means 'you' -- a genuinely confusing swap in conversation.