One Piece : Start As Celestial Dragon And Take Down Hancock - Chapter 125: Queen Titi came into power. Lakeman’s realization.

REBORN OF THE LEGENDARY BEAST MASTER

In this world, there exist Confucians, Daoists, Buddhists, Demons, and Arcanists.Xu Qi’an, a police academy graduate, suddenly finds himself waking up in a prison, set to be exiled to the frontier three days later…His initial goal was to protect himself in this world with no human rights and to be able to live a leisurely life as a rich man.…Many years later, Xu Qi’an looks back on the past, with long-dead enemies and friends, as well as the numerous bones he has left behind.As the Yangtze River flows eastward, the waves wash away the heroes; right and wrong, success or failure will all turn into nothing but history.However, just like the sun’s rays gleaming over the towering mountains, after each sunset, a new sun will rise.

This is a story of a modern man returning to ancient times, returning to a real world without any extraordinaryness, and slowly rising by relying on the ability to attribute all data.

- Description from novelbuddy

After experiencing heartbreak from being abandoned, he enlisted in the military.

And then, he became a war hero.