Empire Within the Brain

Orphan Yun Yi was fortunate enough to obtain an Empire Within the Brain system, randomly traversing to the year 1624, and also being able to return to modern spacetime at any time. From a primitive era to the imperial era, the digital era, and perhaps even the interstellar era, one wonders what he will face when upgrading to the peak. (This story is purely fictional, any resemblance is purely coincidental.)