if i buy iphone in korea how can i disable the camera shutter sound

Hello ~ No… because there are certain countries, such as Japan and South Korea where this sound is mandatory due to privacy laws and cannot be disabled and thus brings attention to unauthorized photography by making a clear sound to alert others that a photo is being taken. 

~Katana-San~

If you don't live in Korea, DON'T buy your phone in Korea. iPhone Warranty is NOT International. Any money you might save by buying an iPhone a country you don't live will quickly evaporate and then some if you need warranty service in the country you live. Can you afford to go back to Korea from where you live if you need warranty support?

No