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
이원은 삶의 여러 측면을 설명하는 데 유용하다.Iwon-eun salm-ui yeoreo cheugmyeon-eul seolmyeonghaneun de yuyonghada.Duality is useful in explaining various aspects of life.