Resolved questions
if "boiling egg" is 삶은 계란, what abt "fried egg"?

I think Korean people long ago didn't cook 'fried egg' so we don't have such a dish. We borrowed some words from several languages such as English, French, German, Japanese and Chinese etc.
Fried egg - 계란 후라이/달걀 후라이/ 계랸 프라이/달걀 프라이 (We pronounce f sound and p sound in the same way)
More examples are here.
버스 bus 택시 taxi 레코드(음반) record 라디오 radio
컴퓨터 computer 가라오케(노래방) karaoke ...