Have you guys heard koreans saying "isseryo~~" or "obseryo~~" they say it all the time ^^
'is ser yo' means "i have" "exist" "do you have it" etc
'ob ser yo' means "dont have" "doesnt exist" "theres none" etc
Theres no direct translation in english for these two, but you get what i mean ^^
Now, 'is ser yo', how to you think its spelt in korean? you would think 이써요 right? wrong~! its actually spelt 있어요. confused? Here's why
When Koreans are speaking, they like to make everything flow off their tongues, to make 있 어 요 flow, if they see a ㅇ, they will replace it with the last consonant that was just before it.
So in 있어요 the last consonant just before ㅇ is ㅆ. Therefore ㅆ will replace ㅇ when pronouncing to become 이써요
Heres a video just incase it doesnt make sense ^^
Here's another example
Music:
Write = 음악
Pronounce = 으막