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
사회사는 인간 사회의 발전을 연구하는 학문입니다.sahoe-sa-neun in-gan sahoe-ui baljeon-eul yeongu-haneun hakmun-imnida.Social history is the study of the development of human societies.