Lu Qitong is the calmest anatomist in the forensic world, and Cheng Jianyu is the sharpest detective knife of the criminal investigation team. When an unknown female body was discovered on a rainy night, the blue paint remaining on her fingertips was exactly the same as the unsolved case three years ago. When Lu Qitong checked the evidence alone in the evidence room, the whole city suddenly fell into darkness. She knelt in front of the cold iron cabinet, and in her hand was the evidence bag handed over by Cheng Jianyu himself - which contained the hairpin of her missing sister. During the 30 minutes of power outage, no one knew what she saw, and no one knew why Cheng Jianyu disappeared in the blind spot of surveillance. When the power was restarted, the evidence bag was empty, and Cheng Jianyu's cuffs were stained with the same blue paint as the corpse.
