Delivery boy Chen Shoujiu bumped into a female pharmacist who fell to her death from the 22nd floor. Everyone said it was suicide, but he found the deceased's bare feet and slippers placed in the entrance hall with the toes facing out - a crime-solving system was bound to his mind, and each case he solved unlocked a god-level skill. Using trace physical evidence, forensic toxicology, and psychological portraits, he relied on ironclad evidence to uncover the people hiding behind hospitals and chemical plants. But who gave the system? Behind the hexagonal mark was the cause of his father's death.
