The Executioner, written by Lee Jehwan, is a dark action-fantasy manhwa that follows Gangyu Seo, a former top-tier hero who takes on a new role as an executioner inside Ruculus, a high-security prison for deadly supervillains. Haunted by personal loss and disillusioned with the hero's code, Gangyu now delivers justice on his own terms. As he confronts the most dangerous criminals, the story explores themes of vengeance, morality, and the price of crossing the line between hero and killer.