Korean · Pronunciation Guide
mwo, one syllable. Round the lips for the w and unround them immediately for the ㅓ -- a small, fast movement all inside a single beat.
mwo
A single short beat whose pitch does the grammatical work: flat it belongs to a statement, rising it becomes the question 'what?'. That contour lives on the phrase rather than on any syllable inside the word.
Listen: 뭐
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이게 뭐예요?
Ige mwoyeyo?
What is this?
Listen: 이게 뭐예요?
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이게 뭐예요? contracts 이것이 down to 이게, worth noticing on its own, and then 뭐예요 runs as three quick beats, mwo-ye-yo. The question is signalled by rising pitch on the final 요, not by any change to 뭐 itself.
The commonest outcome is a two-syllable 'muh-wo' or a fully rounded 'mwoh'. Both miss: it is one beat, and the lips must unround as the vowel arrives. Learners who round throughout end up closer to 모, at which point the sentence stops being a question about anything.