Korean · Pronunciation Guide
eop-tta. The first block carries the double batchim ㅄ, of which only the ㅂ is pronounced, and that stop then tenses the following ㄷ into ㄸ.
eopda
Two beats with a silent closure between them. Two rules stack here -- cluster simplification, which deletes the ㅅ of ㅄ, and post-obstruent tensing, which hardens the ㄷ -- so a word written with four consonant letters comes out with two consonant sounds.
Listen: 없다
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시간이 없어요.
Sigani eopseoyo.
I don't have time.
Listen: 시간이 없어요.
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시간이 없어요 shows the deleted ㅅ coming back to life. With a vowel following, the cluster splits across the boundary and the ㅅ resyllabifies as a tensed ㅆ, giving eop-sseo-yo. The letter that was silent in 없다 is the loudest thing in 없어요.
Learners either try to pronounce both letters of ㅄ, producing 'eops-da', or drop the wrong one and say 'eos-da'. Only the ㅂ survives, and it does not release. The second half then needs a properly tensed ㄸ rather than a soft English d -- and since this verb is the negative counterpart of 있다, which behaves identically, the two are worth drilling as a pair.