Enshrouded by a series of illusions, Yoo Han, a reader of the novel "Ways of Heroes," transmigrated into the world of the protagonist that he admired. However, the protagonist is different from what he thought. The story in that world and his identity as Cail de Castalia, the villain, leads him down an unexpected path. Will he be able to sabotage the plot and change it or succumb to what's called fate?