My SSS-Rank Kingdom-Building System

Leon’s life was a series of struggles: orphaned as a child, thrust into the army at sixteen, and left broken by gambling after he returned to civilian life. But when all hope seemed lost, a strange phenomenon changed everything:

[World-Traveling System Activated!] AKA [SSS-Rank Kingdom-Building System!]

Now transported to a medieval world where strength and cunning rule, Leon wields the power of the system to bridge knowledge from his world to this new one. Armed with his military experience and a sharp mind, he uses the system to rise through the ranks of society, invent new tools of power, and outmaneuver his enemies.