Regressor, Possessor, Reincarnator

Allen, the first son of a declining ducal family, opens a book revealing a truth he wished to ignore: his brother, Julius Reinhart, a former young prodigy, has been possessed by a reader from Earth. This possession signifies the death of his true brother. Driven by desperation for his family's success and a desire to save his brother, Allen, the one who regresses, relives his life. He harbors deep aversion and disgust for Julius due to the possession, viewing him as an imposter, yet he embarks on this second chance to rectify the situation. The story features a unique, fast-paced beginning, exploring themes of possession, reincarnation, and transmigration. While the narrative can be occasionally confusing due to rapid topic shifts and unclear POVs, the characters are well-written and show potential for future development. The plot is considered creative and interesting. The novel distinguishes between regressor, possessor, and reincarnator, with the MC being the regressor and a Korean reader possessing the extra character Julius. The original protagonist is Julius's brother, who is searching for answers.