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
한국의 문호개방 정책은 외국과의 교류를 촉진했다.Hanguk-ui munho gaebang jeongchaek-eun oegug-gwa-ui gyoryu-reul chogjin-haetda.Korea's open door policy has promoted exchanges with foreign countries.