After a rift opened in all parts of the world, everything changed since then. The world were engulfed into chaos and in the midst of fear and desperation. Hunters started being chosen by the system to protect and save the world from the monsters that came along with it. Heo Kyi-on - the rank one hunter, were tangled up with another hunter named Yi-jun who changed his entire world and when the world fell into ruin again and everyone died, Heo Kyi-on suddenly regressed back into the past to change the future.