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
삼강오륜은 유교의 중요한 원칙입니다.samgangoryun-eun yugyo-ui jungyohan wonchik-imnida.The Three Bonds and Five Relationships are important principles of Confucianism.