Reborn in the apocalypse, Yang Hao returns with the "system" and accidentally awakens the remaining soul of the Immortal Sword Master. He thought it was just a cold auxiliary tool, but he didn't know that it was the junior sister of the Sword Master who lost his memory and was living in the world, silently guarding him in the form of a system. In the wasteland where zombies are rampant, he uses the system as a guide, practices ancient swordsmanship, integrates the power of demons, and uses a holy sword to cut down the tide of corpses and protect the loved ones around him. But in the desperate battle, the system transformed by Jian Zun's junior sister completely perished in order to save him. Only then did Yang Hao learn the true identity of the system and continue to move forward in a world where order collapsed. With the help of Jian Zun, his strength increased a lot, and he vowed to save Jian Zun's junior sister's own system.