This is the 6478th most frequent Korean word.
여는
"여는" means "opening" or "someone/thing that opens" depending on context.
The word '여는' here is the present tense form of '열다' (to open) used as a modifier for '문' (door), indicating the action happening currently.
그녀는 문을 여는 중입니다.
She is opening the door.
In this sentence, '여는' modifies the noun '날' (day), describing the specific 'opening day' timeframe.
여는 날의 시간은 오전 9시입니다.
The opening day's time is 9 AM.
'여는 사람' combines '여는' (opening) and '사람' (person), describing 'the person opening' as a subject in the conditional clause.