Morning Light Outside the Territory

Empire A has been invaded by monsters from outside the territory all year round. To this end, the empire cultivated an army called the "Extraterritorial Army" to resist the invasion of monsters. As a magic apprentice at the Imperial Academy, Ning Ke dreams of joining the foreign army and serving the country. So, can he usher in his own dawn in this cruel world... (The background story I wrote for my own setting. It's just a hobby, and the writing is not very good. And my ability is limited, so the setting may be unreasonable, please forgive me. If you see it, it would be best to give some suggestions~)