[Campus] [Semi-Military] [Group Portrait] [Growth and Redemption] In such a martial country, there are always members of the campus security force called "Blue Umbrella" on every junior high and high school campus. They are all students of the same age. What they do is to defend against lawless elements externally and bullying and fights internally. They are also an important source of future defense talents. What is the purpose of Blue Umbrella's establishment, and how is its mission achieved? Let's witness this story together. (This is my first work, and it is quite jerky. The author is busy with academic work, so I try to update it every day. The update is slow and the number of words depends on the situation. Your valuable opinions are welcome. Please criticize and correct any shortcomings. Thank you for your support!)