Korean · Pronunciation Guide
ap. One clipped syllable: an open vowel and a ㅍ whose aspiration is stripped away in final position, leaving a silent lip closure.
ap
A single clipped block. Everything interesting happens when a particle attaches: the buried ㅍ resyllabifies forward and its aspiration returns in full, so 앞 and 앞에 end up with completely different final consonants.
Listen: 앞
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가게 앞에서 만나요.
Gage apeseo mannayo.
Let's meet in front of the shop.
Listen: 가게 앞에서 만나요.
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가게 앞에서 만나요 shows exactly that. With 에서 attached, the ㅍ moves into the vowel and is heard with a real puff, giving a-pe-seo -- the consonant that was silence a moment ago is now the breathiest sound in the phrase.
Releasing the p at the end of the bare word is the standard error, and adding a puff to it is the exaggerated version. Neither happens: the lips simply close. Learners then under-do the aspiration in 앞에, where it genuinely belongs, which is the same mistake running in the opposite direction.