Korean · Pronunciation Guide
yeo-reum. Two unrounded vowels with a tap between them, and the second one is the lip-flat ㅡ.
yeoreum
Two beats. Neither vowel is rounded, so the lips stay flat from the beginning of the word until the ㅁ closes it, and that final closure is the only lip movement in the whole thing.
Listen: 여름
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여름에는 밤에도 더워요.
Yeoreumeneun bamedo deowoyo.
In summer it's hot at night too.
Listen: 여름에는 밤에도 더워요.
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여름에는 밤에도 더워요 stacks two particles on 여름, so the ㅁ moves forward and gives yeo-reu-me-neun. Then 더워요 shows the ㅂ-irregular of 덥다, where the buried stop has turned into a w.
A rounded ㅡ into 'room' is the usual error, encouraged by the ㅁ that follows it, so keep the lips spread until the vowel is finished. The American r is the second, and it slows down a syllable that should be over almost immediately.