Killer Peter is a gritty action-thriller webtoon that dives into the violent underworld of professional assassins and secret organizations, following Peter, a legendary killer thought to be past his prime who is forced back into the shadows when his past resurfaces, igniting a relentless chain of missions, betrayals, and brutal confrontations that test his skill, morality, and survival instincts, delivering fast-paced combat, tactical mind games, and a cold, realistic portrayal of the cost of violence while exploring themes of loyalty, revenge, aging, and identity in a world where killers are both tools and targets, praised for its sharp artwork, intense pacing, and mature tone that appeals strongly to fans of dark action and crime stories, also known as Killer Peter webtoon, Killer Peter manhwa, Killer Peter manga, Killer Peter assassin webtoon, Peter hitman webtoon, Korean action thriller manhwa, and dark assassin webtoon.