I Killed the Main Player is a dark fantasy action webtoon built around betrayal, regression, and ruthless survival in a game-like world, following a protagonist who once trusted the so-called “main player” of the story only to be betrayed and killed, awakening in the past with full knowledge of future events and choosing a radically different path by eliminating the supposed hero early, triggering a complete collapse of the original storyline and forcing the world to react to a new, unpredictable threat, unfolding through intense battles, strategic manipulation, and accelerating power growth as the protagonist exploits hidden mechanics, broken systems, and narrative loopholes to stay ahead of enemies who were never meant to face him, blending revenge-driven motivation with progression fantasy, moral ambiguity, and constant tension that strongly appeals to fans of dark isekai, anti-hero leads, and system-based power scaling, also known as I Killed the Main Player webtoon, I Killed the Main Character, I Killed the Protagonist, Killed the Main Player manhwa, 주인공을 죽였다, regression revenge webtoon, anti-hero game fantasy manhwa, and dark system fantasy webtoon.