The Man from Hell - Chapter 321: Are You Sure?

When we met for the first time in our first year of high school, he saw my contempt, but silently continued to clean;

Using the ability to freely travel between Earth and the fantasy world so he can… become a porter of two worlds…?

Bai Yang’s objective was to establish a production line that would yield hundreds of millions of pills, pellets, and artifacts…

- Description from Novelupdates

This story is set during the end of the Sui Dynasty, a time where multiple powers struggled for supremacy and power.