This is the 19564th most frequent Korean word.
어느새
"Before one knows it; all of a sudden."
The term '어느새' conveys a sense of unexpectedness or sudden awareness of time passing.
어느새 겨울이 찾아왔다.
Winter has arrived before we realized.
Here, '어느새' highlights the unexpectedness of someone approaching or arriving at a location unnoticed.
그는 어느새 내가 있는 곳에 도착해 있었다.
He had already arrived where I was without me noticing.
In this instance, '어느새' describes the speaker becoming immersed in the narrative without realizing when it started happening.