As a child, Yin Ziyu witnessed his mother being murdered. He thought the law would bring the killer to justice, but the murderer escaped punishment by pleading insanity. From then on, young Ziyu was determined to become a police officer and bring every criminal who evaded the law to justice. But after entering the police academy, he realized that the laws he studied could not bring the most evil people to justice. So Yin Ziyu set out on his own path to deliver justice.
