I am leaving a review because I was shocked like I was struck by lightning. As a career developer, I was packaged as someone who does good work to other people, but I always felt like I was falling behind and was anxious that my shortcomings would be revealed to those around me. When I took some time to reflect on myself to see what I was lacking that made me feel so anxious all the time, I realized that the reason for my anxiety was that I didn't lay a solid foundation when I was a beginner, even though I was lucky enough to get a job and make a living as a developer. Kim Young-han's Java lectures make me reflect on myself like I was struck by lightning every time I move on to a new chapter, while also filling in the gaps in my foundation without fail. After listening to everything and reviewing it, and applying it to my work, I think I will be able to grow my career and move forward, so I wanted to say thank you. Thank you!