Korean · Pronunciation Guide
gap. One clipped syllable, and the double batchim ㅄ shows only its ㅂ -- the ㅅ is completely silent here.
gap
A single clipped syllable. Cluster simplification is the whole story: two consonant letters at the end of the syllable and only one sound, which is the same rule that governs 없다 and 없어요.
Listen: 값
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이 가방은 값이 비싸요.
I gabangeun gapsi bissayo.
This bag is expensive.
Listen: 이 가방은 값이 비싸요.
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이 가방은 값이 비싸요 frees the buried ㅅ. With the subject particle attached, the cluster splits and the ㅅ resyllabifies as a tensed ㅆ, so the noun becomes gap-ssi -- the letter that was silent is suddenly the sharpest sound in the phrase.
Attempting to pronounce both letters gives 'gaps', which Korean does not allow at the end of a syllable: only the ㅂ survives and it does not release. Then, in 값이, learners produce a plain s rather than the tensed ㅆ that the ㅂ in front of it forces.