Yeokdaegeum Yeongji Seolgyesa

When civil engineering student Su-Ho Kim falls asleep reading a fantasy novel, he wakes up as a character in the book! Su-Ho 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, Su-Ho 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 Su-Ho dig his new family out of debt and build a better future?

(Source: WEBTOON, edited)