I signed up for the course because I knew he was a lecturer who gave a lot of lectures on IMS and information security, but I was really disappointed. The instructor doesn't seem to understand the content and flow of the lecture materials (didn't he make it himself?) This isn't just a simple knowledge transfer, but a lecture for exam preparation, but he says he doesn't know much about the cloud (while bragging that he got an offer from AWS), and whenever he explains about the network, he rarely explains it clearly, and he keeps saying things like, "I used to remember, but now I can't remember~" or "I can't remember for a moment~", so I can't trust the lecture. Also, I don't know why he tests his memorization in the middle of the lecture. He says he improvises the lecture because he feels embarrassed when he doesn't remember well during the test, but isn't it improvisation in a nice way, or not preparation? How can you make money by giving lectures like this? It seems easy to make money. This kind of lecture costs 10,000 won. It's money, but I listened to it at full speed, but I feel like my time is wasted. I guess Inflearn doesn't manage the quality of the lectures.