I Possessed The Villain In a Hunter Novel And It Fits Me Perfectly

One day, Seo Jehyun finds himself transmigrated as a villain in a modern fantasy novel [I’m the Only Overpowered S-Rank Hunter] written by his old high-school friend But… can this even be called possession? After all, the hidden villain that appears in the novel is already named Seo Jehyun. So, in order not to break the coherence of being the villain and to uncover the cause of everything that’s happened, Seo Jehyun resolves to follow the original plot faithfully. He decides: I’ll do my best to become The Apocalypse. — Description from novelcodex.org