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I'm not used to two consonants changing sounds. It's usually just one of them that changes, so just to verify, is what I heard correct?

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  • 1
    This happens a lot with ㄹ.
    – Michaelyus
    Jan 30 '19 at 14:01
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This is nasalization applied twice.

First, 섭리 > 섭니. Korean Standard Pronunciation, Chapter 5 Assimilation of Sounds, Clause 19, Attachment reads (English translation by myself):

받침 ‘ㄱ, ㅂ’ 뒤에 연결되는 ‘ㄹ’도 [ㄴ]으로 발음한다.
'ㄹ' connected after syllable-final 'ㄱ,ㅂ' is pronounced [ㄴ].

Then, 섭니 > 섬니. Same resource, Clause 18 reads:

받침 ‘ㄱ(ㄲ, ㅋ, ㄳ, ㄺ), ㄷ(ㅅ, ㅆ, ㅈ, ㅊ, ㅌ, ㅎ), ㅂ(ㅍ, ㄼ, ㄿ, ㅄ)’은 ‘ㄴ, ㅁ’ 앞에서 [ㅇ, ㄴ, ㅁ]으로 발음한다.
Syllable-final 'ㄱ(ㄲ, ㅋ, ㄳ, ㄺ), ㄷ(ㅅ, ㅆ, ㅈ, ㅊ, ㅌ, ㅎ), ㅂ(ㅍ, ㄼ, ㄿ, ㅄ)' are pronounced [ㅇ, ㄴ, ㅁ] each, in front of 'ㄴ, ㅁ'.

So there is nothing irregular about this, and you heard it very correctly. Indeed, it is the standard pronunciation according to the Standard Korean Language Dictionary.

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As far as I know, there are two typical ways in pronunciation of words : Tensification - it need a strong muscle and 비음화 - sound from nose.

First, for 걱정, 걱쩡 (tensification). We speak strongly.

And 섭리 -> 섭니 -> 섬니 : First change is (the initial sound of a syllable)-law.

( not 비음 ) + 비음 -> 비음 + 비음 so that ㅂ+ㄴ -> ㅁ+ㄴ

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