When Kim Jieun meets a young woman, who looks exactly like her, she finds herself more than tempted to trade lives and escape from her boring uneventful sub-urban existence into a colorful parallel world. But can an other-worldly stranger really take her role without anyone noticing? And can Jieun survive the treacherous ways of the royal court of Cathay?

In a world quite unlike our own, humans share their living space with all sorts of spirits, demons and deities. Living together isn’t always easy, so benevolent spirits and humans have created police forces that maintain order in densely populated areas. In hope of overcoming his fear of spirits, Huang Zhitao joins the police force of Ghost City, a place for spirit refugees. His first mission under Commissar Wu already fails terribly, but at least he meets Niu, an ambitious village girl,