Criminal investigation captain Huo Qing was falsely accused of being a serial killer and was wanted nationwide within 72 hours. Only forensic doctor Su Yan firmly believed in his innocence, but he did not dare to collect evidence publicly because of his family's taint. Deputy director Zhou Mubai set up a trap step by step, information dealer Chen Huai secretly traded the truth, lawyer Lin Yue used public opinion to crush revenge, and night watchman Lao Dao carved a countdown to death next to the incinerator. When the seventh corpse was discovered, everyone thought Huo Qing was a crazy murderer - no one knew that the corpse was holding the evidence that he had destroyed with his own hands seven years ago.
