Yoon Se-ri, a promising rookie detective, is assigned to work for a corrupt police officer, but her assignment leads her to a criminal organization she shouldn't have touched. She's then unofficially assigned to an assassination operation. The operation area is a ghost town, closed off by a massive sinkhole. Sent there, still scarred by the devastating disaster that claimed the lives of over 40,000 citizens, she discovers hundreds of people in a city where no one should be, and witnesses their even more astonishing supernatural powers...