난공불락(難攻不落) – Korean 4 Character Idioms #14

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With Explanation

In the war history, there are some castles or fortresses that were hardly or even never fallen. They have strong walls and get some benefits from the nature. These strong architectures are called 난공불락 in Korean.

난(難) means hard, 공(攻) means attack. 불(不) means not or no, 락(落) means fall or collapse. 난공불락 means it is hard to attack that castle and that castle never collapses. However, it is not only used to call just some buildings, but it is also used figuratively to call some companies or even people if they are so strong that they are almost invincible.

Examples

몇 년 전만 해도 그 회사는 반도체에 관한 한 난공불락이었는데, 지금은 그냥 평범한 회사들 중 하나가 되어 버렸다.
Only a few years ago, that company was the unreachable top among the semiconductor producers, but they now became one of the ordinary companies.

그 길을 따라 내려가면 성이 하나 나오는데, 중세 시대에 100년이 넘는 세월 동안 수없이 많은 적들의 공격을 받았음에도 함락되지 않은 난공불락의 요새이다.
If you follow that road down, you will see a castle. It is an impregnable fortress of the Middle Age that didn't collapse even though it got numerous attacks from the enemies for more than 100 years.

아무리 난공불락의 보안 시스템을 만들어 놓아도 내부인 한 명이 비밀 번호를 말해 버리면 다 끝난다.
Even if we made an impenetrable security system, it will fall if a single insider tells the password.