They Gave a Reborn Engineer the Worst Swamp and Called Him a Useless Prince

A modern engineer suddenly gets REINCARNATED as the most USELESS PRINCE in a medieval kingdom! While his older brothers inherit wealthy territories, powerful armies, and legendary weapons, he's given the poorest province in the entire kingdom, a place everyone considers beyond saving. Broken roads, constant floods, deadly diseases, and a complete lack of valuable resources make it a living nightmare! But instead of giving up, he decides to launch an incredible ENGINEERING REVOLUTION! Using knowledge from his previous life, he builds concrete fortifications, sewage systems, bridges, roads, and efficient farming infrastructure. Step by step, the forgotten province transforms into one of the WEALTHIEST AND SAFEST regions on the continent! And when war finally breaks out, his army can cross the kingdom faster than even the most powerful knights, thanks to his revolutionary logistics network. But can his powerful brothers stop a prince who, instead of chasing legendary weapons, builds the infrastructure needed to turn a struggling kingdom into an unstoppable SUPERPOWER?