When the dead begin to smile, the truth begins to twist. Former detective Zhou Chen and genius forensic doctor Lin Zhao teamed up to investigate a series of "laughing corpse cases" - seven corpses without any injuries, but all with weird smiles. As the investigation deepened, they discovered that the deceased had undergone mysterious experiments before their death, and the mastermind behind the scenes was actually tied to the truth about the death of Zhou Chen's girlfriend. An old funeral home worker, a reporter who hides his father's secrets, and a pharmacist who never shows up are dragging them into a consciousness game that uses death as an experiment.
