As an SI developer, I mainly developed/maintained legacy projects (MyBatis + Mapper), but I felt thirsty for learning and switched to a backend developer, so I quit my job after working for 2 years and 8 months and am studying for a new job. I have taken many Spring lectures, but this is the best one I have taken. I think you have an amazing ability to easily explain the core contents. I have been relying only on Google and have been developing without understanding why the annotation is used, the life cycle, etc., but I feel like my horizons have been opened up. I am already looking forward to the next lecture! I plan to take JPA Roadmap and Core Principles - Advanced together. I am happy to be able to take Younghan's lecture ^^ Thank you for providing such a high-quality lecture~!!