Investigative reporter Shen Yan, while pursuing a case of illegal demolition, unexpectedly discovered the dark secrets behind real estate developer Zhao Kun, but was caused to fall off a cliff and died. Fate caused him to be reborn as a black cat, and he awakened the "Nine Lives System". Trapped in a cat's body, he lurked beside his enemy, relying on extraordinary perception and an animal intelligence network to step by step collect criminal evidence and uncover the truth. At the same time, he secretly protected his fiancée Su Wan, fighting together with her against Zhao Kun's criminal forces. Facing exposure of his identity, wave after wave of crises, and the tests of fate, Shen Yan used nine chances of rebirth to complete his revenge, bringing the truth back to see the light of day, and ultimately recovering his human identity and the happiness he lost.