Korean · Pronunciation Guide
ha-yan-saek, three light beats. The middle syllable is a y-glide onto an open 'ah', spoken all in one piece.
hayansaek
Level delivery throughout and no stressed syllable. Notice that nothing changes across the seams: 하얀 ends in ㄴ, a nasal, so the ㅅ of 색 stays plain instead of tensing -- and the contrast with 초록색 is worth hearing back to back.
Listen: 하얀색
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하얀색 모자를 쓰고 있어요.
Hayansaek mojareul sseugo isseoyo.
I'm wearing a white hat.
Listen: 하얀색 모자를 쓰고 있어요.
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하얀색 모자를 쓰고 있어요 triggers nasalization across the word boundary. The ㄱ of 색 sits in front of the ㅁ of 모자, and a stop cannot survive before a nasal, so it turns into ng: ha-yan-saeng mo-ja in connected speech. The 쓰고 that follows opens with a tensed ㅆ over the ㅡ vowel.
The temptation is 'ha-YAN-saek' with an English stress bump on the middle, and to split ㅑ into two syllables, 'hee-ahn'. It is one beat. The vowel in 얀 is the open ㅏ, so the syllable is 'yahn' -- neither 'yehn' nor 'yun' -- with the mouth wide and the lips unrounded.