For a full 4 months, I watched the lectures and practiced typing with the goal of organizing them one by one in a blog, rather than just reading and passing over the lecture PPTs. I tried to improve my chronic eagle typing style and hope that I would remember them at least a little. I finished the course very late, making excuses like being busy and sick, but I finally did it. In fact, I have no reason to touch JPA at SI, but if there are more people like me who want to challenge and learn new things, and if the day comes when JPA is used by more companies and developers than now, I believe that the day will come when JPA will naturally be used at SI. I should study diligently with the dream of escaping SI. I would like to express my gratitude to instructor Kim Young-han for creating and sharing such a great lecture.