What a Bountiful Harvest, Demon Lord!

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)
Note: includes 12 extra chapters.

In a twist of fate, the life of a doctor of Korean medicine flips upside down in a single night. Doctor Han Lee is reborn as Lachiel, the sickly Crown Prince of the Empire of Magentano. Han is now armed with medical knowledge and skills found nowhere else in this new world -- but can he heal an empire and mend his own body at the same time? Witness his journey of self-exploration and resilience as he maps destiny's meridian, in pursuit of the acupoint that can reverse his fate.(Source: WEBTOON)