Dear officer,

My name is Yulong SHAO, student_id 2021-33517, and I major in Energy Resources Engineering.I'm having some problems about my course in this semester, named Advanced Construction Materials (2022년도, 1학기, M1586.002600_001). I find there are several videos that show 0% progress, but I have watched all of videos before the deadline. I don't know if it's bad internet or other problems. Attached is watching detail to validate that I have watched the video before the deadline. I do not know the reason why some of videos show 0%, but I did watch them before the deadline. Can you help me check these classes and modify the process status? Because it is very important for me, otherwise I will get an F in this class. 

Best regards 

Yulong