Pursuing the Murderer with a Ghost Pen: a Dialogue Between Police and Souls Spanning Thirty Years

One side is the 1980s when criminal investigation was backward and strange things happened frequently, and the other side is the future city where science and technology are advanced but old crimes are riddled with it. A mysterious pen spans thirty years of life and death. As the two team up to solve the backlog of unsolved cases, horrific and supernatural events follow: a female ghost in red appears on a rainy night, the pages of case files turn automatically, the corpse remains incorruptible, the ghost borrows a pen to send a message, the blue mark on the wrist is cursed... They gradually discover that all the unsolved cases point to the same serial murderer spanning thirty years, and the secret of the pen, the truth about the old detective's suicide, and the strange pursuit across time are far more terrifying than ghosts. As more cases are solved, the curse becomes deeper and deeper. Not only do they have to hunt down the murderer and save the souls of the dead, but they also have to fight against the backlash of time and space. When the truth was revealed layer by layer, the two were shocked to realize that this cross-time and space dialogue was a fateful arrangement from the beginning.