Demons from secret realms have come to this world, disguising themselves so perfectly that they look just like ordinary people. A group of people across the world seeks out the secrets of these realms, entering them to experience different lives. Some secret realms are too dangerous for ordinary humans and are forbidden zones, while the Forbidden Demon City is the most forbidden of all. The moment Yan Pochuan picked up the Demon-Slaying Sword, his return to the secret realm from his childhood dreams became inevitable. He was destined to become the master of that realm.
