A lecture where everything was combined and understood as I listened to it... I kept saying "Wow..." I started without listening to the JPA lecture because I'm a wild type, but when he skipped over the emphasis on JPA in the middle, I was a little worried, but after listening to it, I think I understand why he told me to listen to this first! Trust the instructor unconditionally and listen to this first.. Really ㅠ Thank you always