Moo Young comes back to life as a zombie thanks to illegally dumped medical waste. With his memory gone, he eventually accepts reality and does whatever he can to walk and look like a human. Seon Ji, who once was a writer for a TV show that deals with issues regarding current affairs, is employed as a part-time assistant at Moo Young's agency. As she helps the zombie detective look for the traces of his lost memories, she comes to realize how Moo Young is related to one of her previous cases.