Korean · Pronunciation Guide
ju-seu. A borrowed word, and the borrowing shows: English 'juice' ends in a consonant, and Korean adds the ㅡ vowel to make it a legal syllable.
juseu
Two beats, and the second is a full syllable rather than a trailing consonant. That is the crucial rhythmic fact about Korean loanwords: they gain syllables, and each one gets the same weight as the others.
Listen: 주스
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저는 주스를 좋아해요.
Jeoneun juseureul joahaeyo.
I like juice.
Listen: 저는 주스를 좋아해요.
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저는 주스를 좋아해요 attaches the object particle to a vowel-final noun, so nothing shifts there, and 좋아해요 deletes the ㅎ of 좋 between vowels, running as jo-a-hae-yo.
English speakers say 'joos' and stop, collapsing the second syllable into a final consonant, when Korean has two beats here and both are real. The vowel is the other problem, since 'joo-soo' rounds a vowel that must stay flat -- the two syllables should not rhyme.