It tells the story of Ning Zhen's personal death when he was a child, and his mother disappeared, and only he saw a suspicious man.In order to prevent the suspicious man from committing another crime, the criminal police captain Lu Zheng was brutally killed.At some point, a strange symbol was left on the scene. The blood-red symbol was deeply imprinted in the hearts of Ning Zhen (played by Fei Qiming), Lu Zheng's daughter Lu Fan (played by Wang Xiaoyunzi) and his apprentice Cao Jin. Since then, this symbol has been called “Abyss”.The only person who has seen “abyss becomes the ”key to solve the mystery.Years later, “Abyss” appears again

The fate of the two generations was tied together again, as if they could never escape the fate...