Regressor, Possessor, Reincarnator

Allen opened the book.
And there it was.
The fact he wanted to ignore. No, the fact he actually was aware of.
[…Reader Kim Woojin, 21.
Possessed the extra character, ‘Julius Reinhart’, of the novel “The Feast of the Returned Demon King”…]
Julius Reinhart.
My brother’s body was stolen by a possessor.
That day, my brother died.