Korean · Pronunciation Guide
kkae-kkeu-ta-da. Two tensed ㄲ sounds in a row, and then the ㅅ batchim of 끗 fuses with the ㅎ into an aspirated ㅌ.
kkaekkeutada
Four blocks, level, but the effort is anything but even: two tensed onsets, then an aspirate, then nothing. Word stress plays no part, and the shape you perceive comes entirely from where the throat tightens.
Listen: 깨끗하다
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부엌이 아주 깨끗해요.
Bueoki aju kkaekkeutaeyo.
The kitchen is very clean.
Listen: 부엌이 아주 깨끗해요.
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부엌이 아주 깨끗해요 conjugates to 깨끗해요 and puts a nice recovery in front: 부엌 ends in ㅋ, whose aspiration is stripped in final position, but with the particle 이 attached it resyllabifies and returns in full, giving bu-eo-ki.
Producing two ordinary k sounds turns the word into something a Korean listener will not recognize, because both need genuine tension. The third syllable then trips people again, since they try to say 'kkeut-ha-da' with a stop, a gap and an h -- the ㅅ and the ㅎ combine into one aspirated consonant with no break in it.