Every Time a Case Is Solved, There Is Another Top-Secret File

[Criminal investigation + suspense + serial crime + group portrait + behind-the-scenes organization] During a heavy rainstorm, a suitcase was abandoned on the river bank, containing a headless male body. Fake wedding rings, mysterious leaves, fragments of medical gloves, and the man in black who disappeared into the rainy night pushing a trolley under surveillance made Interpol Gu Yan realize that this was no ordinary corpse dumping case. As the investigation deepens, seemingly unrelated cases emerge one after another: disappearances, kidnappings, human experiments, identity replacement, secret room murders... Behind every murderer, there seems to be the same invisible organization - "Abyss". They study fear, manipulate desires, and use human nature as experimental material. What Gu Yan and his teammates have to do is not only to catch the murderer, but also to find the truth among countless lies and perjury. The headless corpse in the rainy night is just the first file. The real abyss has just opened.