The book tells the story of a group of serial killers who have been terrorizing South Korea for years, and the first profiler who has been tasked with tracking them down. The book begins with the introduction of the protagonist, a young and ambitious profiler named Park Min-young, who has just been assigned to the Serious Crime Unit of the Korean National Police Agency. She is determined to make a name for herself in the male-dominated field of criminal psychology and prove her worth as a top-notch profiler. However, she soon realizes that the cases she is working on are not your average run-of-the-mill murders. The victims all have one thing in common - they are all connected to a mysterious figure known only as "The Shadow a mastermind behind a series of gruesome killings that have left the police baffled for years. As Park delves deeper into the case, she discovers that The Shadow is not just a single individual but a collective of serial killers who have been recruited by a powerful organization with ties to the government. They are using their skills to manipulate and control the media, creating a culture of fear and paranoia that benefits their own interests. But as Park gets closer to uncovering the truth, she finds herself in grave danger, and must use all her wits and resources to stay one step ahead of The Shadow and bring them to justice. Throughout the book, Park's personal life is also explored, as she struggles to balance her career ambitions with her relationships and her own sense of self-worth. She is constantly torn between her desire to succeed and her fear of failure, and must navigate the treacherous waters of office politics and personal rivalries to stay on top of her game.

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