Another theme could be the exploration of fate. By reversing time, the emperor is essentially trying to change the course of events, which challenges the concept of fate. Is it possible to truly change one's destiny? Or are there some things that are meant to be no matter how much time is reversed? The novel might delve into these philosophical questions through the emperor's experiences.
Sorry, I haven't read this novel specifically. But generally, a novel with such a title might involve a plot where an emperor has the ability to reverse time. This could lead to all kinds of interesting scenarios, like changing historical events, undoing mistakes, or exploring different paths of his reign.
Webtoon does have a few 18+ comics. However, their availability can vary depending on your region and the platform's content regulations. Some might be hidden behind age verification or specific access settings.