No Mu Jin is a labor attorney who sees ghosts. Mu Jin is someone who lives for a living without any sense of history or social awareness. He wanders around labor sites to earn office rent, and after coming back from the brink of death, he grows up solving labor problems requested by ghosts while crying and eating mustard. Na Hui Ju is the brain behind the failure of No Mu Jin's office and his sister-in-law, who controls him. Hui Ju has no specific job, but she is quick-witted like a ghost when it comes to money-making matters, and she possesses excellent judgment and fiery fighting skills. Ko Gyeon U is a video creator who started out as a reporter. Gyeon U is a tall and handsome man with a witty personality and an unpredictable sense of humor. He makes videos that are more concerned with “views” than “meaning,” but he also has a pure side that is touched by the stories of ghosts.