Korean · Pronunciation Guide
ik-tta. The block 읽 carries the double batchim ㄺ, and in front of a consonant only the ㄱ is pronounced -- the ㄹ stays silent.
ikda
Two beats separated by a closure. The cluster rule is the whole story: ㄺ keeps its second member before a consonant, which is the opposite of what ㄼ does in 여덟, so the two clusters have to be learned as separate cases rather than one pattern.
Listen: 읽다
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이 책을 읽고 있어요.
I chaegeul ilgo isseoyo.
I'm reading this book.
Listen: 이 책을 읽고 있어요.
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이 책을 읽고 있어요 conjugates to 읽고, where the ㄹ is the member that survives instead, and it tenses the following ㄱ -- so careful pronunciation gives il-kko. That flip between 읽다 and 읽고 is one of the trickier corners of the cluster rules.
Trying to say both letters gives 'ilk-da', a sequence Korean does not permit at the end of a syllable. Only one member survives, and here it is the ㄱ. The second half then needs the tensed ㄸ rather than a soft English d, and that tension is the change learners most often miss, because nothing in the spelling signals it.