[Support Service] * Cyber.ybmnet.co.kr member-only functions -You can take lectures anytime, anywhere with mobile course support -Recognized as a PC in conjunction with e-Learning such as attendance, progress rate, and class time -Check the course registration function, course contents, and schedule for courses currently available for registration (including phone English) -When downloading videos, you can listen to unlimited repetitions within the training period. -How to delete download data: