Hi! When I started with Korean, there was something about the pronounciation of consonants that threw me off. ㅂcan sometimes sound like a „p“ and sometimes like a „b“, ㄷ can sometimes sound like a „d“ and sometimes like a „t“. There are a few more Korean consonantes that follow that scheme. 

After I realized the logic behind it, it reminded me of something: German! In German we have the very same thing, it is even with the very same consonants, I just did not realize it as a native speaker. 

I wanted to give you some examples of what I mean, I will write the name in German put an english translation in brackets and then write the pronounciation of the word in Korean letters, I hope this helps the Korean readers to see what I mean. I also pronounce the german words at the start of the video on the bottom.

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Normal pronounciation „g“ example:

gähnen (yawn) 깨넌

„g“ pronounced like „k“

gucken (look)  쿠건

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Normal pronounciation „d“ example:

dick (thick) 띡

„d“ pronounced like „t“

Land (land,country)

(there are only silibels with 3 consonants and 1 vowel that follow that rule, I dont think i can put 3 consonants in a korean sign, can I?)

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Normal pronounciation „b“ example:

Bibel (bible) 삐벌

„b“ pronounced like „p“

Liebling (darling) 맆린

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ㅈ, ㅊ, ㅅ have also similiarities to the German „s“ (sch, st ,sp, ß), but the German „s“ is hard to explain and I also struggele a little with ㅈ, ㅊ, ㅅ as you can see in the video.

https://www.youtube.com/watch?v=FnNB0NtiwBw&feature=youtu.be

Edit: forgot the original video with the pronounciation ^^*
https://steemit.com/kr/@morning/korean-language-course-for-beginners-3-variation-of-consonants