Interstellar Alien: but Comes with Its Own Lagrangian System

The long night, the vast river. 20 Years ago, I was still an ignorant boy in college, and I embarked on an interstellar journey from here. 20 Years later, I looked at the strength of 800,000 versus 600,000 troops and gradually became confused. Why was I so honest before? (There is no harem in this book!! No harem!!!)