Why Can't I Go Back in Time?

The undercover agent was betrayed by his teammates and his soul traveled to a different world. Although he became the lord of another world and lived a happy life, he had to torment the industrial revolution in the feudal society just to one day return to the earth to take revenge. So he transformed the mythical beast army, asked them to take off their armor, put on redwood, shoulder their guns, and began to use hot weapons to sweep across the alien continent. This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.