Using a lost gun as a clue to the secrets that have been sealed in time, young detective Wen Binbin (played by Ding Yuxi) searches for his lost gun with the help of detachment leader Xing Liang (played by Ning Li).In the fight against the evil forces, he was unyielding and remained determined after going through hardships. He finally discovered the truth and captured the real culprit behind the scenes, and wiped out all the evil forces.