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
운영부는 회사의 효율성을 높이는 일을 담당합니다.unyeongbuneun hoesaui hyoyulseong-eul nopineun il-eul damdanghamnida.The operations department is responsible for improving the company's efficiency.