someone who watches or listens to everything that is happening without anyone noticing their presence
in a secretive way so that the general public is unaware of what is happening
a list with contact information of people whom one secretly communicates with
검은 책
used to refer to a situation where two or more people, organizations, etc. are secretly collaborating with each other to do something dishonest or illegal
to secretly or dishonestly intend to achieve wealth, power, etc.
to secretly take pleasure in something or find it amusing, particularly someone else's problems and misfortunes
used to refer to something that happens unexpectedly and without warning or detection
in a manner that is done secretly or subtly, often to achieve a desired result without drawing much attention
a coded message intended to be understood by a particular group while remaining unnoticed or ambiguous to others
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