This is a review of the course.. The overall flow is explained well through the architecture explanation and live debugging. (This part has many merits.) 1. The internal architecture is explained thoroughly. 2. The part where the architecture is explained through live debugging was good. There are some limitations for those who want to get used to it by following the lecture. 1. The source code changes every time the lecture is given. 2. The source code is uploaded to GitHub, but there are often cases where the actual lecture and the source code are different. Overall, it was not bad, and the explanation was good, but there were many confusing moments for beginners who are new to security.