Black Friday: lifetime access is on a special offer in the app, until November 30. Black Friday: special offer on lifetime access, until November 30. Download
소유층은 사회의 경제적 불평등을 나타냅니다.Soyucheung-eun sahoe-ui gyeongjejeok bulpyeongdeung-eul natanabnida.The ownership class represents the economic inequality in society.