The Reason Why the Protagonist of That Book Became a Ball

“Do you think I’m stupid? That I wouldn’t recognize my own guide?” Yeah. I think you might actually be stupid. Yeonwoo reads a book given to him by his younger sister, Yeonhwa, and learns that she will die. In order to save Yeonhwa, Han Yeonwoo, a C-class esper, enters a dungeon, saves Kang Chaheon, the S-class esper who was the protagonist of the book, and dies. Or so he dreams. [How adorable. You really thought that was just a dream?] Turns out, it wasn't a dream. Realizing that he has returned to the past, Yeonwoo tries to change the future. While Yeonwoo struggles, Kang Chaheon, who knows nothing, sees Yeonwoo's kindness and starts looking for a place to lie down and stretch his legs...