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
이 프로그램은 사용자와 시스템 간의 계면을 제공합니다.I peurogeuraemeun sayongja wa siseutem gan-ui gye-myeon-eul jegonghamnida.This program provides an interface between the user and the system.