Korean · Pronunciation Guide
il-ha-da. The ㅎ sits between a ㄹ and a vowel, so it thins out badly -- casual speech comes close to i-ra-da.
ilhada
Equal weight across the three syllables, though the middle shortens as the ㅎ weakens. This is the same lenition seen in 말하다, and the pattern generalizes: any ㅎ trapped between voiced sounds is a candidate for reduction rather than a fixed consonant.
Listen: 일하다
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저는 사무실에서 일해요.
Jeoneun samusireseo ilhaeyo.
I work in an office.
Listen: 저는 사무실에서 일해요.
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저는 사무실에서 일해요 gives you the conjugated 일해요, which at speed lands close to i-rae-yo, and 사무실에서 passes its ㄹ forward to produce sa-mu-si-re-seo. Two ㄹ sounds in one sentence, both taps, both created by a vowel arriving after a batchim.
Forcing a full English h makes 'il-HA-da' sound over-enunciated, which is the most common way learners get this word wrong. Let it weaken. The other issue is the l: an English dark l with the tongue humped at the back muddies the first syllable, where Korean wants the tip up and the sound bright.