You may think it is expensive, but the lecture content was never poor or unprepared. From Spring Boot 2.1 to 2.4, we have faithfully prepared the major changes and things to watch out for when upgrading the version, and we will provide additional information on the upcoming 2.5. The lecture price has been discounted by 25% for quite some time considering the special nature of this lecture. Nevertheless, if you say, "It is expensive compared to the content and preparation," because you think it is expensive, I am leaving a comment because I am afraid that the lecture content and preparation will seem poor. This is a really disheartening comment.