This is the 19442nd most frequent Korean word.
야간
"야간" means "nighttime" or "at night" in English.
In this sentence, 야간 (yakaan) is used to refer to 'night' or the time period during night, in the context of nighttime work shifts.
야간 근무는 피곤하지만 보람이 있어요.
Night shifts are tiring but rewarding.
Here, 야간 (yakaan) describes something that occurs at night, such as a train schedule or type of service.
야간 열차를 타고 부산에 갔어요.
I took the night train to Busan.
In this sentence, 야간 (yakaan) characterizes the activity of walking as happening during nighttime.