This is the 7830th most frequent Korean word.
핵심이다
"핵심이다" means "to be the core, essence, or key point."
핵심 in this sentence refers to the central or most significant part of the problem.
문제의 핵심이다.
It is the core of the issue.
핵심 conveys the idea of being crucial or important in this context.
핵심이다, 그래서 우리는 집중해야 한다.
It is essential, so we must focus.
핵심 is used to indicate the key element or factor contributing to the project's success.