Korean · Pronunciation Guide
kkeun-na-da. The 끝 is written with a ㅌ, but in front of the ㄴ it nasalizes all the way to an n, so the word carries a long double n through its middle.
kkeunnada
Three beats, with the first two joined by a held double n. The nasalization is the headline: a stop turning into a nasal because of what follows it is one of Korean's most audible assimilations, and it is why the romanization writes kkeunnada rather than kkeutnada.
Listen: 끝나다
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일이 여섯 시에 끝나요.
Iri yeoseot sie kkeunnayo.
Work finishes at six.
Listen: 일이 여섯 시에 끝나요.
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일이 여섯 시에 끝나요 shows the same nasalization in the conjugated form, and 일이 at the front sends its ㄹ across into the particle, giving i-ri. The sentence therefore opens on a light tap and finishes on a heavy geminate nasal.
Reading the spelling gives 'kkeut-na-da' with an audible t, which Korean does not allow, since a stop cannot stand in front of a nasal. The opening syllable is the other difficulty, because the tensed ㄲ and the ㅡ vowel fight English habits simultaneously -- learners soften the consonant to a plain k and round the vowel to 'oo', losing both features in one go.