Lee Joon plays the serial killer Ryu Tae Oh in the drama. In the 2nd episode, he had a cast on one arm and he tried to pull his motorcycle back upright again. A woman passed by him and hesitated, unsure of whether to help him or not. In the end, she decided to help him, and even led him to her workshop (because he was so charming).

SEE ALSO: "Koo Jun Yup's heartbreaking cries were painful to hear," Late Barbie Hsu's close friend shares the final moments and grief

However, when they were alone, his warm smile turned into a frigid smirk and he said, "Let's play the zombie game." He started unwrapping his cast, and told her, "Choose. Would you like to be the zombie, or the person running away?". She chose the person, he smiled and said, "Too bad. You chose the wrong thing. It would've been easier if you said you wanted to be the zombie."

Check out the eerie clip below, are you watching the drama?