In Lanjiang City, Country A, Lin Zhixia grew up with her police detective parents nurturing her artistic talents. She should have had a wonderful life: parents who loved and respected each other and bravely threw themselves into the front lines, an outgoing older brother who was caring and sharp-tongued at times, and excellent grades. For Lin Zhixia, those were her happiest days. But when she was twelve, it all proved to be an illusion. Her parents died in the line of duty while investigating a serial murder case, leaving the siblings to depend on each other. At eighteen, she was supposed to follow the life plan laid out for her and apply to an art academy, but instead she secretly applied to the police academy without telling her brother. The two had a huge fight. Their parents' deaths had been ruled accidental casualties during a mission, but neither Lin Zhixia nor her brother, Lin Zhiheng, would accept that. The serial murder case was riddled with suspicious details, and the arrest operation was full of holes. They were convinced their parents' deaths had not been an accident, and that a hidden conspiracy lay behind them. The doubts and resentment had been buried in their hearts for twelve long years. Then, as Lin Zhixia and Lin Zhiheng investigate cases alongside Lin Zhiheng's childhood friends, Gu Mingchen and Shen Yu, they stumble upon clues to a long-forgotten case. The traces buried by time gradually point toward the serial murder case in which Lin Zhixia's parents died. As the investigation deepens, the old case and new ones prove to be intricately connected. The truth deliberately covered up all those years ago begins to surface: the truth behind her parents' deaths and the serial killer's identity are finally revealed, layer by layer...