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Ji Oh (Kim Rae-Won) is a timid man, thrown into a world where he has no clue about his own identity and the "power" and "secrets" that set him apart from ordinary people. Amid endless conflicts with those searching for their own identities, Ji Oh must strive to find answers to the countless questions surrounding his own existence.

Goo Reum (Lee Da-Hee) is transferred from the Major Crimes Unit while investigating the corrupt behavior of a high-ranking officer. Goo Reum is someone who acts before she thinks, always moving forward before making a decision. Her disrupted life takes a new turn when she encounters Ji Oh during a missing child case. Goo Reum's parents disappeared when she was just a child. Now, she relentlessly pursues the truth behind the disappearance of her beloved teacher, amidst the chaos of her own life.