A top ace assassin from the Dragon Kingdom is hunted down by a coalition of rival assassin organizations. Unexpectedly, he is reborn in a parallel-world island nation, inhabiting the body of a low-ranking Iron-tier assassin. The original owner of the body was killed by his target during his very first assignment. After inheriting this body, however, he embarks on an extraordinary journey of assassination. Every target mysteriously dies in some kind of accident, yet all the credit goes to him, and the bounty money keeps rolling in. The higher-ups of various assassin organizations believe he possesses unfathomable skills, never realizing that he has not personally lifted a finger from beginning to end. Thus begins a legendary assassination saga filled with one unbelievable coincidence after another.