This is the 6553rd most frequent Korean word.
오기
"오기" means stubbornness, persistence, or determination.
In this sentence, '오기' refers to the action of 'coming' (arrival), associated with the friend visiting.
내일 친구가 오기 때문에 저녁 식사를 준비해야 해요.
I need to prepare dinner because a friend is coming tomorrow.
Here, '오기' metaphorically indicates the sense of an opportunity arriving or becoming present.
지금이 성공의 전환점이 될 기회가 오기 시작했어요.
The opportunity for success has started arriving now.
In this context, '오기' is used to describe the onset or coming of a feeling, specifically 'sleepiness.'