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.
Episode 1
A man wakes up as a zombie. He tries to survive in this world by pretending to be human. Will he be able to fool other humans? Meanwhile, Seon Ji tries to find the Santa from the kidnapping and murder case.
Episode 2
Moo Young is taken to the hospital after being hit by a helmet. However, he doesn’t want his identity to be revealed, so he runs away. Meanwhile, Bo Ra opens up a tripe restaurant. Seon Ji finds the witness and begs for an interview.
Episode 3
Moo Young is taken to the hospital after being hit by a helmet. However, he doesn’t want his identity to be revealed, so he runs away. Meanwhile, Bo Ra opens up a tripe restaurant. Seon Ji finds the witness and begs for an interview.
Episode 4
Zombie, Moo Young returns with a suspicious pill from the fast center. It’s called as a weight-loss supplement and given to all members at the center. But it clearly has something fishy about it, and Seon Ji takes it away to examine it.
Episode 5
With the help of Tae Kyun, Seon Ji realizes that Kim Moo Young is a zombie. Stunned and scared of getting eaten alive, she unwillingly goes to see him dressed in full combat gear to get desperately needed money owed to her. When she's about to leave his office, she faints due to her appendix bursting.
Episode 6
Seon Ji tries to help Moo Young remember his past life, but nothing seems to work. However, Moo Young begins to think of the possibility that he had a family in the past and feels a sense of emptiness in his life. Meanwhile, Seon Ji and Moo Young run into Hyeong Cheol while tracking down a lead on Moo Young’s past.
Episode 7
A man breaks into Moo Young’s office, and Seong Rok and Wei see it. As Moo Young finds out that the intruder has only stolen his lighter, he suspects that the intruder might be someone who knows his past. Meanwhile, Moo Young is invited to Joon Woo’s birthday party.
Episode 8
Hyeong Cheol tells Moo Young about his horrible past, and he gets devastated. As Moo Young tries to kill himself, Seon Ji tries to reach him to tell him about another version of his past. Meanwhile, Seon Ji runs into danger while investigating So Ri’s death.
Episode 9
After Hyeong Cheol’s death, Moo Young tries to erase all of his traces and leave. While Seon Ji tries to reach Moo Young, he passes out due to hunger and finds himself in his office. Meanwhile, Tae Kyun visits Moo Young and explains the story about his new zombie movie.
Episode 10
After Poong Shik is discharged from prison, he goes to Seong Rok and asks him to follow Moo Young. As Moo Young remembers what Poong Shik did before going to prison, he and Seon Ji start investigating his past. Meanwhile, Do Hyun happens to see Kang Min Ho’s picture and gets suspicious.
Episode 11
Moo Young and Seon Ji find out about Poong Shik’s illegal experiments on animals. And in order to find out more about Poong Shik, they ask Seong Rok about the Shadow Case where Poong Shik’s daughter went missing.
Episode 12
Poong Shik escapes from the police car while being transferred to the police station after being arrested. After hearing the news, Seong Rok, Wei, and Seon Ji tell the police that Poong Shik has created a zombie, but no one believes. Meanwhile, a man’s body is found in the mountains.
