During the Northern Song Dynasty, Dao – a young and capable fighter – travels to the capital in hopes of becoming a constable. However, he accidentally stumbles upon an underground society called the Wuyinmen, each member with a supernatural ability. One day, Wuyinmen member Zhuge returns with Yuan, a mysterious young girl. However, she brings not only just hope, but also trouble and panic. She can transform into a human-monster hybrid at any time, which can lead to a major catastrophe. Meanwhile, a terrifying creature has been hiding in our world, waiting for its chance to destroy mankind. Will the extraordinary warriors of the Wuyinmen fight back and take down the creature together?