First of all, the class itself was very helpful. However, the class itself was not very informative or had a lot of content, so I had to look up the technologies and terms used and study them while listening. Above all, the text was so small that I couldn't read it unless I viewed it in full screen, so I felt that it was lacking in the basic aspects of a development lecture. In conclusion, I think it was a bit of a waste to pay 20,000 won. I would have been satisfied if you had lowered the price to around 10,000 won or increased the content in more detail. Again, the class itself was very helpful. Thank you.