After studying and struggling on my own with Mr. Choi Beom-gyun's Spring 5 Programming Introduction book, I wanted to grow more, so I took this course while looking for a lecture. I thought there were definitely things I missed, but he made me realize those parts and helped me understand them one by one, so I was able to review them again and accept new things. I was proud, and whenever I got tired, the instructor's playful smile gave me strength. I really wanted to say thank you.