In the era of nuclear winter, the earth is scorched, and human beings are surviving in three major bases. Jhin, codenamed "Ashes", is the sharpest knife in the "Light of Dawn" base. He travels through the wasteland and performs the "justice" mission of eliminating dissidents. Until one time, his accompanying "Shadow System" issued a piercing alarm - all "assassination instructions" actually pointed to the same mysterious signal source, and the targets, without exception, were those top scientists who could restore the ecology and rekindle the hope of mankind! When loyalty was torn apart by lies, and when killing became an accomplice to strangle the future, Jhin resolutely turned against the enemy and turned from a hero of the base into a "traitor" jointly pursued by the three bases. He must race against time to protect the remaining "seed of hope" in the countdown to nuclear winter and expose the shocking conspiracy of the "Purifier" behind the scenes. Doomsday Assassin, this time, he no longer lives for killing, but fights for redemption. Even if he is the enemy of the whole world, he must change his destiny and restart civilization!