After washing his hands, Hu Bayi helped his friend Uncle Ming go to the South China Sea to salvage the pearls. Unexpectedly, he encountered a shipwreck and fell to the bottom of the sea, but accidentally found a thousand-year-old ruins of an ancient country that sank at the bottom of the sea. They went through many hardships and dangers at the bottom of the sea, and finally united to defeat the deep-sea beasts, and cleverly used the equipment in the ruins to escape.

During a sunny holiday, a sightseeing cruise ship heading to "Happiness Island" encountered a shipwreck. Only Ning Yu, Zhang Xinchen and several survivors were washed up on an isolated island without coordinates or signals. Soon, they realized that this quiet island was not a refuge, and there was a strange atmosphere everywhere. Ning Yu, A Qiang and others went to find water. In a huge stone cave, they found two dried corpses and an old red notebook. That night, A Qiang looked pale and muttered to himself as if he was possessed. And the red notebook recorded the unprecedented horror that these survivors were about to face.