Gray rain descends on Donghai City, and the mysterious ecological factor "Gray Tide" begins to rewrite biological genes. Scientific researcher Lu Chen traces the truth behind the disappearance of his father Lu Heng ten years ago, and forms an escape team with Lin Jin, Chen Mo, Shen Zhixia, and Qi Bai to uncover the Ark Gene's conspiracy to screen humans through disasters. When cities, oceans and plants wake up at the same time, humans must answer: Are they still worthy of being left on the earth?
