Korean · Pronunciation Guide
mwon-ga. The first block compresses m, a w-glide and the unrounded ㅓ into one beat, and the ㄱ voices after the nasal.
mwonga
The first of the two blocks is doing a great deal of work. It is still one beat, though, and stretching it into two is the main way learners distort this word.
Listen: 뭔가
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뭔가 좀 이상해요.
Mwonga jom isanghaeyo.
Something is a bit strange.
Listen: 뭔가 좀 이상해요.
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뭔가 좀 이상해요 puts the pronoun first, and 이상해요 lenites its ㅎ between voiced sounds while holding the ㅇ of 상 as a nasal into the next syllable. Nothing in the sentence has a stop closure in it.
'mu-eon-ga' with three syllables is the standard error, because English does not compress a glide and a vowel that tightly -- keep it to two. The other slip is rounding the ㅓ so the whole first syllable stays rounded, when the lips must open out as the vowel arrives.