I Killed an Academy Player (Korean: 아카데미 플레이어를 죽였다) is a standout entry in the "Academy" and "Dark Fantasy" genres, masterfully written by Sul-Yohan and brought to life through the atmospheric art of Nenyu. The series distinguishes itself by immediately dismantling the standard "isekai hero" narrative. Instead of following the chosen one, it explores the life of a man forced to become a "replacement" after executing the world's original savior. It is a high-stakes psychological thriller that explores the heavy burden of meta-knowledge and the moral gray areas of saving a world through an act of murder.

The narrative centers on a protagonist transported into a brutal RPG world where the "original" Hero—a regressor—has become a corrupted tyrant destined to trigger a "Bad Ending." Realizing the world's only hope is the Hero's removal, the protagonist kills him and assumes his identity within the elite academy. Lacking the original's innate genius, he must navigate a "Grim Academy" environment, using his knowledge of hidden items and future tragedies to survive. Every interaction is a tactical gamble, as he struggles to prevent the apocalypse while hiding his secret from instructors and rivals who knew the person he replaced.

Alternative Names and Titles
I Killed an Academy Player / I Killed the Player / 아카데미 플레이어를 죽였다 / Oneulman Saneun Gisa