Korean · Pronunciation Guide
man-ta. The double batchim ㄶ shows only its ㄴ as a consonant, while the hidden ㅎ jumps forward and aspirates the ㄷ into ㅌ.
manta
Two blocks delivered flat. The structure is identical to 괜찮다, and the two are worth learning as a pair, because both hide a ㅎ inside a cluster and both spend it on aspirating the next consonant instead of pronouncing it as itself.
Listen: 많다
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오늘 사람이 많아요.
Oneul sarami manayo.
There are a lot of people today.
Listen: 오늘 사람이 많아요.
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오늘 사람이 많아요 shows the other outcome: with a vowel following, the ㅎ is deleted outright and the ㄴ resyllabifies forward, giving ma-na-yo with no aspiration anywhere. One cluster, two completely different results depending on what comes next.
Saying 'man-da' with a soft d loses the ㅎ entirely, and that is the commonest version among learners. The breath has to go somewhere, and it goes onto the t. Some also try to pronounce the ㅎ as its own syllable, producing 'man-heu-da', which inserts a beat that simply does not exist.