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In a seemingly peaceful coastal city, bizarre deaths occur one after another. All the dead were holding a withered red rose in their hands, and their corpses showed a strange twisted posture. The only clue is the mysterious hourglass left at the scene. This hourglass seems to be related to an unsolved case twenty years ago, and it all points to a young forensic anthropologist Su Wan. Main plot: The story begins when Su Wan discovers a mysterious hourglass in an antique shop. That night, she received a call from the police and went to investigate a bizarre death. At the scene, she found the red rose and the mysterious hourglass in the deceased's hand, which were strikingly similar to the clues her father left behind. As the investigation deepened, Su Wan gradually uncovered a secret that had been hidden for twenty years, and she herself fell into a fatal trap.