“Huh?! Kyaaaaak!!! W-Why did I suddenly become an anchovy?!!!”
He majors in food and nutrition and has a first-class certificate as a daily sports instructor, the epitome of being a fitness enthusiast, Choi Young-jik! Well, that was who he used to be…
Waking up in the body of Prince Soo-yang, the second son of King Se-jong the Great, he lost all of his bulging muscles overnight.
Young-jik was taken aback when he realized he might be able to meet King Se-jong, his father. He couldn't contain his excitement at the thought of meeting the magnificent King Se-jong, whether or not it was a dream or reality.
H-Huh? King Se-jong… the Great😕
There sits in front of him, a chubby man who looks like he's struggling to breathe.
King Se-jong the Great appears to be severely obese and possibly diabetic… Government officials had chronic illnesses and frail bodies…
Choi Young-jik, a seasoned fitness trainer with 15 years under his belt—holding the pride of the fitness community—begins to feel a fire ignite inside him.
“Alright, shall I try spreading the fitness craze in Joseon?!”
Original Web Novel: Munpia, Ridi, Joara, Naver Series, KakaoPage, Onestory, Tocsoda, Mr. Blue, Bookcube, Bufftoon, Mootoon
Original Webtoon: Daum, KakaoPage


This is an alt history story about a modern gym enthusiast and bodybuilder who introduces a bunch of modern concepts and technologies into the former kingdom of Korea, in particular bodybuilding and improved firearms.
The bodybuilding is fun regardless of its implausibility. (You'd assume there was neither sufficient metalworking know-how to make the gym equipment, nor sufficient nutritious food to support bodybuilding.)
However, the firearms and warfare aspects of the story leave me cold. They're comparatively unoriginal, in that you've seen stuff like this before in other stories. Plus the politics don't make a lot of sense, since the MC introduces new firearms but must then immediately provide some as tribute to a larger geopolitical power. Which makes it a highly questionable move to introduce new military tech in the first place.
In short, in the WN, he tortures others before killing them.
i'm in danger
Sure there is a chance that his cyberized husk is strong enough to resist but he won't go out unscathed.