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
그는 색광증이 있어서 색을 구별하기 어렵다.geuneun saekgwangjeungi isseoseo saekeul gubyeolhagi eoryeopda.He has a color vision deficiency, so it is difficult for him to distinguish colors.