Kang Jik-han, a righteous police officer who was demoted for reporting his colleague, arrives on an island. While struggling between his family's safety and his stubborn sense of justice due to his continued misfortune, he encounters a suspicious secret on the island. Unable to turn a blind eye, Jik-han ultimately loses his beloved family to the island's residents and vows to become a monster like them, seeking greater justice against the villains who disregard the law.