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.

The zombie disguise as Kim Moo Young and enters the agency. He meticulously tries to become like a human. He also learns that it requires money to live in the human world. He gets a request, but it turns out to be a kid looking for his pet.

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.

Moo Young works as a part-timer at the restaurant opening. The show airs with Seon Ji’s interview. However, the witness gets attacked by the criminal. Seon Ji is devastated. After getting drunk, Seon Ji gets kidnapped, but Moo Young rescues her for a different reason.

Seon Ji wakes up after a heavy night of drinking

Moo Young the Zombie admits himself to Gangrim Fast Center to find Yoon Ju.

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.

Seon Ji and Moo Young the Zombie’s perfect plan works out and they save Yoon Ju out from the fast center. They both get paid and finally get to enjoy their free time. The cult leader, Chairman Lee is in prison and nothing could be better.

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.

Seon Ji makes a deal with Moo Young and starts working at his detective agency as an intern. However, her curiosity gets her sent home on her first day. Meanwhile, Moo Young buys his first suit with the money he earned after making up his mind to stick with detective work while he searches for his past.

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.

Seon Ji gets Moo Young to help find Hyeong Cheol’s mother who is lost in the mountain. While in the mountains, Moo Young catches a wild boar with his bare hands and becomes a hero. Seong Rok is jealous of Moo Young, and his suspicions that there’s something weird about Moo Young grows.

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.

Hyeong Cheol comes to see Moo Young at his place. As they talk, Moo Young senses something suspicious about him. So, he asks Seong Rok to follow Hyeong Cheol secretly. Meanwhile, Moo Young and Seon Ji try to find out who killed So Ri.

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.

Hyeong Cheol runs away with his family while the police look for them. As they investigate the case, Moo Young starts to find out the truth behind So Ri’s death and his past as a human. Meanwhile, Hyeong Cheol, who doesn’t know Moo Young is a zombie, tries to kill him.

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.

After Seon Ji meets Moo Young again in the agency office, she tries to persuade him to stay and run the detective agency again together. Meanwhile, Seon Ji tries to train Moo Young in order to control his hunger and urge to eat humans.

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.

Seong Rok and Wei set a trap Moo Young to bring him to Poong Shik, and Seong Rok feels something suspicious about Moo Young. Meanwhile, Moo Young and Seon Ji begin to find out about mysteries surrounding the real Kim Moo Young and Noh Poong Shik.

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.

The reason that Poong Shik has been doing the secret experiments to make zombies is revealed. While Moo Young, Seong Rok, and Wei are confined in Poong Shik’s vet clinic, Seon Ji goes to help them escape.

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.

Moo Young goes to Poong Shik alone with his wife’s body to save Seon Ji, but Poong Shik is too strong for Moo Young to take down. Meanwhile, Seong Rok, Wei, and Bo Ra carry out another plan to capture Poong Shik.