The Mamashin, known for bringing plagues, was actually a protector of humans! Though feared and hated by people for supposedly spreading disease, this god secretly served as a guardian spirit, protecting human souls from evil spirits who coveted them. Cheolhyeon, who has just become a newly Mamashin, receives his first mission: to investigate a village where people have mysteriously disappeared. During his investigation, he encounters a powerful new evil spirit called “Steel Demon” that dares to challenge even the gods, putting him in grave danger... Can Cheolhyeon successfully complete his first mission?