I'm taking the Spring lecture at the national university, but there were many parts that I didn't understand well. Spring is Kim Young-han!! After hearing the official, I hesitated to buy it from Inflearn, but decided to take the first course and make a decision. As soon as I took a few lectures in the first course, I ended up buying the roadmap. I really agree with you. When learning something, I think that you need to know why it's necessary and what its function is in order to understand and use it well. I was so lacking in those areas, but you explained it so well that I finished reading it once all night. I will listen diligently until I make the roadmap mine. Thank you for the great lecture!!