Once upon a time, in a land far away…lived the ordinary and painfully single high school literature teacher, Bu Taekwon. Ordinary, that is, until he found himself transported into one of his students' comic books. But this wasn't your typical comic book adventure, and Taekwon never anticipated the unconventional genre awaiting him. To his despair, he was now trapped in a hardcore BL fantasy world, where sex-crazed maniacs - dudes no less! - were ready to enact unspeakable acts upon him. The last thing the forever-single Taekwon desired was to…mingle with the men of this insane realm. But can he really manage to fend off their advances and safeguard his virginity

“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 breath.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?!”