While watching 기황후 (there are 51 episodes and we only just finished episode 20, so be prepared for more posts starting like this) I heard the word 기밀 (secret).
Many of you already know the word 비밀, but chances are you are also new to the word 기밀. There is a pretty simple difference: the scale of the secret.
비밀 is what we normally associate with the word “secret”. The one you share with family and friends.
기밀 on the other hand is a large scale secret; State secrets, company secrets, and the like.
As my Korean friend noted, if you’re a spy you’re in the business of 기밀 rather than 비밀.
I don’t think I will ever forget 기밀 after that explanation 😉