Private detective Ke Han received an unusual commission - Lin Yuqing claimed that her father Lin Zhiyuan did not fall to his death accidentally, but was murdered. Although the police ruled it a suicide, Lin Yuqing firmly believed that his father had discovered some ulterior secret before his death.
Ke Han's investigation soon fell into confusion:
- **Lin Zhiyuan's office was completely cleaned**, the safe was empty, and the encrypted files on the computer pointed to a **"Children's Educational Software Project"** that had been buried for many years.
- **Lin Yuqing's whereabouts are strange**, she seems to know more than she appears on the surface, and may even not be the real Lin Yuqing at all**.
- **A string of mysterious numbers "317468"**, which is both a password and a clue, is inexplicably consistent with the faded tattoo "317" on Ke Han's wrist.
When Ke Han investigated in depth, he was ambushed by a professional killer and injected with a serum that could awaken deep memories. While in a coma, he was shocked to discover that he was once the "Night Owl", the core agent of the Blue Bird organization, who was responsible for the transportation of "special goods" to the child trafficking network.
**Three years ago, he betrayed the organization and let go of a girl named "317", and was hunted down for this. A man-made "car accident" caused him to lose part of his memory and was reborn as "Ke Han". But now, the Communist Bluebird organization has found his body, and Lin Zhiyuan's death is just the tip of the iceberg of this huge conspiracy...
