I listened to the lecture well! It was burdensome to listen to each filter one by one while debugging, but somehow I organized it, and now I know where to check when there is a security problem. Haha I was worried because the security version was a little different, but I think the big picture hasn't changed. And the ability to check the changed parts while debugging them myself was also developed while listening to the lecture. I was a little worried about the lecture materials while reading the course reviews before the lecture started, but I never got stuck because of the lecture materials while proceeding with the lecture. I'm currently learning security at a national academy, and if I hadn't taken this lecture, I would have only had a superficial understanding. I'll listen to the next lecture well. Thank you.