Musketeers of the Earthly Immortal Realm

The squad leader traveled through time ten years ago and has been here for 3,650 years. Doesn't that mean that one day on earth is one year here? Hmm…… It feels so familiar, don't worry, let me kill the person who wants to harm me with a gun first and then think about why. Let me think about this battle, should I use a sniper or a rifle? How did I find him in my sniper scope? This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.