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
사상계에서의 변화는 사회에 큰 영향을 미친다.Sasang-gyeeseoui byeonhwa-neun sahoe-e keun yeonghyang-eul michinda.Changes in the ideological realm have a significant impact on society.