Korean · Pronunciation Guide
jeon-hwa-ha-da. Both ㅎ sounds sit between voiced neighbours and weaken, so fast speech tends toward jeo-nwa-ha-da.
jeonhwahada
Uniform timing from start to finish. The pronunciation genuinely varies with speed here: careful speech keeps both h sounds audible, casual speech reduces them until the ㄴ links straight into the w-glide, and neither version is incorrect.
Listen: 전화하다
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나중에 전화할게요.
Najunge jeonhwahalgeyo.
I'll call you later.
Listen: 나중에 전화할게요.
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나중에 전화할게요 uses the -ㄹ게요 ending, where the ㄹ tenses the ㄱ into ㄲ, so the verb finishes jeon-hwa-hal-kke-yo. Ahead of it, 나중에 carries its ㅇ across into the particle, so the ng holds through the join instead of being released.
Giving both h sounds full English force produces a hard, staccato 'jeon-HWA-HA-da', which is the most audible way to get this word wrong. Let them lenite. The other correction is the first vowel, which has to stay unrounded, since 'john-hwa' with a rounded ㅗ is a different syllable entirely.