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
쌍무 계약은 두 당사자 간의 의무를 규정합니다.ssangmu gyeyakeun du dangsaja gan-ui uimu-reul gyujeonghamnida.A bilateral contract defines the obligations between the two parties.