7-hwangjaneun Aemaehaeseo Talchulhamnida

After collapsing from sudden pain at the close of an exhausting day, the narrator wakes up reincarnated inside the fantasy novel Dark Header, only to find himself in the body of the corrupt Seventh Prince who is fated to be executed three years down the line. With that grim future in mind, he sets a single objective: keep a low profile until the story's true protagonist shows up, then slip quietly out of the empire. The plot of the original tale, however, starts moving much sooner than anticipated, and as he travels between the palace and the slums, he begins a discreet campaign to keep the damage under control. (Source: Naver)