Yeokdaegeum Yeongji Seolgyesa | 역대급 영지 설계사 | 史上最高の領地設計士 | The World's Best Engineer | 史诗级领地设计师 | Система всемогущего дизайнера | 史詩級領地設計師 | El Mejor Ingeniero del Mundo | El Mejor Diseñador Inmobiliario | MŚCICHUJ | দ্য গ্রেটেস্ট এস্টেট ডেভেলপার | Bậc Thầy Thiết Kế Điền Trang | The Greatest Estate Designer | The Greatest Estate Developer | O Maior Desenvolvedor de Imóveis | สุดยอดสถาปนิกในตำนาน | The World's Best Estate Designer | The Greatest Real Estate Developer

The Greatest Estate Developer (Korean: 역대급 영지 설계사; RR: Yeokdaegeup yeongji seolgyesa) is a South Korean web novel series written by BK_Moon. It was serialized on Naver Corporation's web novel platform Naver Web Novel from June 2019 to November 2020. A manhwa adaptation, which was released as a webtoon, adapted by Lee Hyun‑min, and illustrated by Kim Hyun‑soo, began serialization on Naver Corporation's webtoon platform Naver Webtoon in August 2021. As of November 2025, the webtoon's individual chapters have been collected into seven volumes.

When civil engineering student Suho Kim falls asleep reading a fantasy novel, he wakes up as a character in the book.

Suho is now in the body of Lloyd Frontera, a lazy noble who loves to drink, and whose family is in a mountain of debt. Using his engineering knowledge, Suho designs inventions to avert the terrible future that lies in wait for him.

With the help of a giant hamster, a knight, and the world’s magic, can Suho dig his new family out of debt and build a better future?