Kim Moo-Young wakes up to find he has become a zombie with no memories of his past. Witnessing the death of a Detective, he has assumed his identity to try discover the mysteries of his past. Meanwhile, Kong Sun-Ji works as investigative journalist who quits whilst investigating the 'Santa Killer' case. By chance the two are brought together and various circumstances lead to Sun-Ji working at Moo-Young's detective agency as an intern.
After Moo Young is brought back to life as a zombie due to illegal medical waste, he loses his memory but adapts to his new reality. With his keen sense of smell, he becomes a private investigator specializing in finding missing bodies. Sun Ji, a hot-tempered former TV writer, works as his part-time assistant. As she helps Moo Young search for his lost memories, she discovers his connection to one of her past cases.