Lloyd Frontera is arguably the worst scoundrel on earth. As the eldest son, he spends his time drinking and bullying others, draining what little remains of his family's fortune. The Fronteras' knight, Javier Asrahan, is fated to become a celebrated swordmaster, while Lloyd's family is doomed to a wretched end as their estate collapses under crushing debt. Kim Suho was once an ordinary civil engineering student in Korea, but he suddenly awakens on a dirt path as Lloyd, the ungrateful hooligan from the early chapters of a novel centered on the protagonist, Javier. Although a snarky status window provides some insight into his new identity, Suho is deeply concerned about his impending ruin. To avoid becoming a beggar and instead secure a pleasant, comfortable life, Suho resolves to repair Lloyd's reputation as a scumbag. Leveraging his engineering knowledge and a magical boost to his construction skills, Suho introduces modern innovations and urban developments to this medieval-style world, significantly enhancing the populace's quality of life—all for a handsome profit.