긋 sounds 귿 according to the following Rule1
Representative Sounds for Consonants (자음의 대표값)
[Rule 1]
If a consonant is a Final Sound in a stand-alone syllable, it can be pronounced as one of only 7
sounds: ㄱ, ㄴ, ㄷ, ㄹ, ㅁ, ㅂ, ㅇ
where the consonants as a Final Sound belong to:
[ㄱ] ◄ ㄱ, ㄲ, ㅋ, ㄳ, ㄺ
[ㄴ] ◄ ㄴ, ㄵ
[ㄷ] ◄ ㄷ, ㅅ, ㅆ, ㅈ, ㅊ, ㅌ
[ㄹ] ◄ ㄹ, ㄼ, ㄽ, ㄾ
[ㅁ] ◄ ㅁ, ㄻ
[ㅂ] ◄ ㅂ, ㅍ, ㅄ, ㄿ
[ㅇ] ◄ ㅇ
[Rule 2]
A Final Sound pronounces as its representative sound (in Rule 1), if it is followed by a consonant.
<보기>
솟고 낚다 있다 높다 젖다 앉다 넓다 닭고기
[Rule 3]
A Final Sound recovers its original sound if it is followed by a vowel, unless they are at the border of
an independent combination.
<보기>
솟아 낚아 있어 높아 젖은
[Comparison] Dependent combination: 옷을 입어요. (Original sound recovered)
Independent combination: 옷 입어요. (Pronounced as representative sound)