Korean · Pronunciation Guide
mu-seop-tta. A light ㅅ in the middle, an unreleased ㅂ, and a tensed ㄸ at the end.
museopda
Three beats with a silent closure before the last. This is another ㅂ-irregular, so 무섭다 becomes 무서워요 and the stop turns into a w, removing every closure from the conjugated form.
Listen: 무섭다
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저는 개가 무서워요.
Jeoneun gaega museowoyo.
I'm scared of dogs.
Listen: 저는 개가 무서워요.
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저는 개가 무서워요 uses that irregular form, mu-seo-wo-yo, so nothing in the sentence has a stop closure at the surface. The subject 개가 is two open syllables with a soft ㄱ.
Rounding the ㅓ into 'mu-sop' matches it to the first vowel when the two should differ. Then the ending needs its tensed ㄸ rather than a soft d, and the ㅂ needs to be a silent closure rather than a released p -- three separate things, all invisible in the romanization.