It was a lecture that made me go, “Wow, wow!” As Younghan said, it was like watching magic, but he explained the principles, reasons, and analysis right away, so it was like a magician showing a really amazing magic trick and then telling me the secret to the magic! It was so fun, enjoyable, and amazing. I have to go listen to the next QueryDSL lecture right away, so I’ll end my review here. ㅎㅎ;