When criminal profiler Shen Zhaoming is performing an autopsy on the 23rd body, the livestream camera catches the dead person's eyelashes twitching. As the whole internet witnesses the corpse seemingly come back to life, DNA from his fiancée, who died by suicide ten years ago, is found on the inside of his forensic gloves.
When his silhouette appears in surveillance footage from a string of murders, Shen Zhaoming suddenly realizes that every victim had appeared as a passerby in his childhood photos. Even more terrifying, hidden deep inside their maggot-ridden eye sockets are fluorescent codes only he can see: the final messages he designed for his sister, who was dying of cancer.
As he flees, the moment a morgue drawer suddenly springs open, he sees his sister, frozen for ten years, tapping out Morse code with her rotting fingers: "Big brother, kill them all."
