Ten years ago, Dong Qingqing, a girl from Jianghai City No. 3 Middle School, fell to her death. Forensic doctor Dong Pengyu discovered a mysterious crescent-shaped bruise on her neck on the autopsy table. Three years later, the serial falling from buildings resurfaced. The same scars and blood-stained triangle symbols on the bodies drew Dong Pengyu and investigative reporter Chang Huanhuan into a dark whirlpool that spanned life and death.
