My stepsisters are sexy demons, and I must protect them - Chapter 21: To finally stretch out after fourteen years

In a land where no magic is present. A land where the strong make the rules and the weak have to obey. A land filled with alluring treasures and beauty, yet also filled with unforeseen danger. Three years ago, Xiao Yan, who had shown talents none had seen in decades, suddenly lost everything. His powers, his reputation, and his promise to his mother. What sorcery has caused him to lose all of his powers? And why has his fiancee suddenly shown up?

A man who was once called the world’s strongest agent ended up becoming a teacher after his retirement, to train a new generation of agents. After many years of training his disciples, he was killed at the age of 60 by a secret organization’s ruse and was reincarnated in another world with his memories intact. Though he was surprised by the existence of magic and the strange species in that world, he quickly adapted to his condition as a newborn and took advantage of it. He acquired special magic and gained a massive amount of strength thanks to his rigorous discipline, in order to reach his goal: Resume his career as a teacher which he left halfway through in his previous life. This is the story of a man, who, based on the memories and the experiences of his previous life, became a teacher who travels through the world with his students.

Everyone has friends in their lives, right?They can be anyone—good friends, bad friends, or even... friends with benefits.Ahem!Anyway, the point is, everyone has friends. And so did I.I was friends with author of web novel.Yeah, was.A small argument over how the main character should act in novel of [World’s Greatest Hero] led to a fight with my friend, the author.Still frustrated, I stormed out of his house... and that’s when Truck-kun hit me.But that wasn’t the worst part.The worst part? I woke up in a different body—the body of a side character in my friend’s novel.A character who is supposed to die in the prologue.[Your body is dying!][You don’t have much time left.][The creator of this world is mocking you.]F#ck you, Author.F#ck this novel.I will survive, and when I do—I'll beat you to a pulp!---

I was reborn into a chaebol family.Into a time with no cryptocurrency, no internet, and nothing else.