This is a very good lecture. I think you just need to practice as much as you are told and move on. If this course is difficult, it would be good to take another beginner's course. One thing that is unfortunate is that, as others have mentioned, the small sound is so hard. I often get into trouble because I turn up the computer volume. ㅠㅠ If you use an encoder, you can easily increase the volume. Also, when you inhale during the lecture, you often make a 'sseu~' sound, which is quite annoying when listening with earphones.