Chen Yu was originally the director of the Second Operations Division of Bureau 421, which specializes in handling strange incidents. During a mission three years ago, he was ambushed by foreign forces. Yun Xiaohan, the director of the first division, died in Kunlun.
Under the pull of various forces, she was treated as a "scapegoat" and sent to a contact point in Sheng'an County.
Now that the three-year period is up, it's time for her to return to her original position and make things return to the way they should be.
Concept: The story of Chen Yu returning to Bureau 421 while dealing with strange things from various places while pulling out the traitors within.