It tells that when Ning Zhen was a child, he witnessed the scene where his father was killed, and his mother disappeared. Only he saw a suspicious man.Interpol captain Lu Zheng was brutally killed to prevent the suspicious man from committing another murder.I don't know when a strange symbol was left at 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. From then on, this...The symbol is called “Abyss”.The only person who has seen “the abyss” becomes the “key” to solve the mystery.Many years later, “Abyss” appears again

The fate of the two generations is tied together again, as if it is a fate that can never be escaped...