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
계면조는 두 개의 서로 다른 매체 사이의 경계를 나타냅니다.gye-myeon-jo-neun du gae-ui seoro dareun maechi sai-ui gyeong-gye-reul natanabnida.The interface represents the boundary between two different media.