Killer Peter is a gritty action-suspense manhwa that follows Peter, an elderly man who was once the world’s most feared and legendary professional assassin. After spending decades at the top of the underworld, he is betrayed and left for dead by the very organization he helped build. However, instead of dying, Peter undergoes a mysterious and sudden physical "regression"—his mind remains that of a master killer with decades of experience, but his body is restored to its prime teenage form.

Now hidden in plain sight as a high school student, Peter begins a systematic and ruthless campaign to dismantle the syndicate that betrayed him. Utilizing his god-tier combat instincts, tactical knowledge, and a young body that can finally keep up with his lethal intentions, he hunts down his former protégés and associates one by one. For fans of overpowered protagonists, satisfying "bully-crushing" moments, and slick, fast-paced martial arts choreography, Killer Peter is a premier choice for 2026.

Series Details & Alternative Titles:
Genre: Action, Drama, Seinen, Revenge, School Life.

Alternative Names: 킬러 피터, Killeo Piteo, Killer P, Peter the Killer, 杀手彼得.