used to refer to someone who is trying their best to prove that they are more intelligent compared to others, often in a way that is annoying

비꼬는 녀석, 까칠한 녀석
someone who is considered the teacher's favorite student and therefore has advantage over others in the classroom

선생님의 애완학생, 선생님의 총애를 받는 학생
used for saying that someone may appear threatening or aggressive, but their actions or behavior are not as harmful or severe as their words
used to describe a person who behaves in a very traditional and morally conservative manner
someone who is very strict and thinks in a very traditional way

보수적 사람, 엄격한 사람
used to describe someone who continuously talks about what they are planning to do, but they never do or achieve much
a person who insists on giving advice about something even though they are not forced to do so

뒷좌석 운전사, 사사건건 간섭하는 사람
a person who tries to gain the approval of important people by the means of flattery, praise, etc.

아첨꾼, 아주 좋은 것만 말하는 사람
a serious flaw or weakness in one's character that other people are not aware of
used to describe a person who tends to say things that sound intimidating when in reality they are afraid to take action
to praise one's own abilities or accomplishments, often in an exaggerated way
an individual who consistently seeks to appear more clever than others in a manner that can be bothersome

똑똑이, 재치 있는 사람
a person who tries hard to let others know that they always do the right thing and behave well
an annoying individual who behaves as if they know everything

똑똑한 척하는 사람, 시건방진 사람
