In Jiangcheng at midnight, there are always secrets hidden in the shadows. Trainee forensic doctor Lin Yan witnessed a bizarre fall from a building at zero o'clock. The deceased was holding a strange coat of arms that only she could understand. From then on, she was involved in a series of murders, and she and the cold-faced criminal investigation captain Shen Zhiwei went from being suspicious of each other to fighting side by side. The zero witnesses not only saw death, but also saw the deepest darkness and redemption in the human heart.
