Korean · Pronunciation Guide
mun. One syllable framed by two nasals: a lip-closed m, a high rounded ㅜ, and a tongue-tip n.
mun
One beat, and because both consonants are nasals the whole syllable is continuously voiced, so it can be held a little longer than a stop-final word without sounding odd.
Listen: 문
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누가 문을 두드리고 있어요.
Nuga muneul dudeurigo isseoyo.
Someone is knocking on the door.
Listen: 누가 문을 두드리고 있어요.
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누가 문을 두드리고 있어요 attaches 을, so the ㄴ moves into the particle and the noun becomes mu-neul. Then 두드리고 gives you a plain ㄷ twice, once word-initially and once between vowels, in adjacent syllables.
English nasalizes the vowel before a final n -- think of 'moon' -- and Korean keeps the vowel clean until the tongue actually makes contact, so keep them separate. The vowel also needs full rounding, since letting it slacken toward the vowel of 'put' blurs a very short word.