The Seventh Symbol

On a rainy night, a seventh corpse suddenly appeared deep in the old alley. A series of strange and precise symbols were engraved on the deceased's chest - not a tattoo, not a knife carving. The structural logic completely deviated from any existing coding system, like a mark from an unknown dimension. Lin Yu, the leader of the serious crime team, squatted in the cordon, his fingertips hovering above the symbol. The red blood in his eyes hid extreme paranoia and confusion: This was the seventh symbol of the same type he had seen in three months, and it was also the forgotten and blurred shadow in his childhood memory.