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In the year 1997, an enigmatic spirit made a sudden appearance on Earth, seemingly to save humankind from an unforeseen threat. After completing its mission, the apparition vanished without a trace, leaving behind a curious mystery. Fast forward to the present day: this elusive entity reemerges two decades later to carry out another unexpected act - this time assisting in the escape of a notorious serial killer.Kim Sae Ha, a driven detective with an unwavering sense of duty, finds herself entangled in the case as she pursues the ghost in hopes of recapturing the dangerous fugitive. Meanwhile, Jung Sae Byeok, a tenacious journalist, is also hot on the ghost's trail, seeking to unravel the secret behind its reappearance and uncover the truth hidden within its enigmatic existence. Lastly, Song Eo Jin, an empathetic psychic, becomes entwined with the otherworldly spirit as he follows it in a bid to comprehend the deeper meaning behind its actions and resolve the turmoil stirring within his own soul.As these three individuals converge on their shared quest, they begin to question the ghost's true intentions and motives - unraveling a complex web of secrets, lies, and hidden agendas that will force them all to confront their deepest fears and face the darker side of humanity. Together, they embark on an intense and thought-provoking journey through a labyrinthine world where nothing is quite as it seems and the line between right and wrong becomes increasingly blurred.