639 In My Past (Part 4)

It had been seven years since he became a slave to the Demon Princess. During this time, he was trained by the other Human slaves, allowing him to grow by leaps and bounds, already becoming a Grandmaster by the tender age of 15.

And among her slaves, he was the most noteworthy, especially since the Demon Princess had made the largest concession for him—leaving his village alone and even providing it protection.

Of course, in response to that, he had to perform every dirty task that had been handed to him, including the killing of important human nobles that played a pivotal role in the resistance of the humans against the Demon Empire.

The place they were on was known as the Felera Continent, a gigantic continent in the Fantasy World whose area was almost equal to the surface area of Earth.

And this continent was currently being invaded by the Demons that had only occupied a small portion of the continent's west in the past.