In a commercial building on the outskirts of Seoul, there's an office with a strange name: Mystic Dawn Exorcism Office . As the name suggests, it handles exorcism, fortune-telling, dream interpretation, and the like... but the owner of this place doesn't believe in the paranormal at all.

Heo Jeong-ah, the owner, looks like a tiny child at first glance, but she always lives with pride and a sense of superiority. Thinking of herself as a brilliant detective and psychologist, she feels superior by using her talents to take money from the ignorant who are obsessed with superstition. Fortunately, it's not that she doesn't want to help her clients. She just likes to 'rationally' solve the worries of those who believe in ghosts and then get paid for it. But why is she so afraid of the word 'doctor' in psychology, when she's so proud of her psychology?

Instead of the unreliable owner Heo Jeong-ah, Jamie is in charge of virtually all the office's operations of Mystic Dawn Exorcism Office . In addition to clerical work and initial customer service... even dealing with actual ghosts. Of course, the owner doesn't believe in Jamie's spiritual abilities at all. She thinks it's a method acting to deceive customers.

They don't even know that Cheon Seon-hwa, a local spirit, is wandering around their office. She is said to have been a very skilled shaman in her lifetime. However, blinded by greed, she did things that were no different from a swindler, and as a result, she accumulated karma worthy of being dragged to the realm of hungry ghosts, becoming a ghost and hiding from the eyes of the Grim Reapers. A weak and timid ghost, her daily life is to huddle in a corner of the office with her hair disheveled and her hanbok trailing, but she also helps to understand psychic phenomena by utilizing her knowledge from her lifetime.

It's a shabby office with many difficulties, but as Jeong-ah says, isn't it clear that it's helpful to society anyway? Moreover, solving psychic phenomena might lighten Seon-hwa's karma. Not to mention making money!