I Work as a Guard in Bureau 749

My name is Mr. Zhang, and I am the most inconspicuous guard in the 749 Bureau. I am also the most powerful guard. I am also the highest paid guard in the country. This gate post is the first line of defense for the 749 Bureau. If someone breaks in from outside, the gate post must be the first to go up. At the same time, the gate post is also the last line of defense internally. If something escapes from within Bureau 749, then my gate post will be the final blocking force.