핵심
Romanisation: haeksim
key; crucial
Example sentence
이것이 문제의 핵심이에요.
igeosi munjeui haeksimieyo.
This is the key point of the problem.
What 핵심 means
핵심 (haeksim) is a Korean word meaning “key; crucial”. It belongs to the Describing Words topic and appears at Level 4, so it is one of the words worth learning early when you study Korean.