Rebirth, YY, brother and sister, end of the world, upgrade system, gunman profession. The above are the keywords of this work. To put it more specifically, a person who travels to a parallel space suddenly faces the arrival of the end of the world. Unfortunately, he became a zombie. Fortunately, he had a zombie sister. This is the story of a zombie brother taking the zombie sister to live happily in the end of the world. There is emotion, joy, and more humane interpretation and life perception. The end of the world is everywhere, as long as you are there, the end of the world is also heaven.