In previous pronunciation change post, I said there are more changes, right? Here is the second one.
When final consonants ㄱ(ㄲ,ㅋ),ㄷ(ㅌ,ㅅ,ㅆ,ㅈ,ㅊ),ㅂ(ㅍ) meet ‘ㄱ,ㄷ,ㅂ,ㅅ,ㅈ‘,
‘ㄱ,ㄷ,ㅂ,ㅅ,ㅈ’ sound change to ‘ㄲ,ㄸ,ㅃ,ㅆ,ㅉ‘.
You can also listen to the pronunciation here.
If you don’t know how to read final consonants, you can click here to learn.