Border Storm: I Guard the Abandoned Border Gate as My Backbone

I was thrown into the most remote and broken prison in the empire and became a captain. His subordinates are all abandoned soldiers with their own "problems", their military salary has been deducted by corrupt officials, and there is no end to winter in sight. I just want to get enough seniority and be transferred as soon as possible. But soon I discovered that this evil door could swallow up all sounds, and it seemed as if there were huge secrets buried under it. The cavalry of Di Kingdom want to break through the barrier, the big boss of the court wants to reach out, and the mysterious "Shadow Pavilion" is staring in the dark like a poisonous snake. They all said that this checkpoint was a burden and that we were abandoned children who should die at the border checkpoint. Later, the elite Di people were smashed here, the imperial envoys shut up and got out, and the whole world began to ask for the name of Yakou Guan. The emperor issued a decree and asked me what I wanted. I turned around, looked at my brother who crawled out from the pile of dead people behind me, and replied: "At this level, I have guarded it as the backbone of the world. Now, it is my home. I will chop off the claws of anyone who stretches out his claws." (Non-traditional fantasy, focusing on: frontier infrastructure, suspenseful group portraits, wits and crushing, and the daily life of a group of "problem characters".)