The protagonist Chen Yu traveled through time and became a "marine son-in-law" who was sacrificed, and was bound to the system to encounter a "drowning ghost chasing the sea" (Rule 1: Do not pick up floating corpse objects).
In order to save the children, he used black dog blood bait to catch [Old Stumps and Tentacles], which triggered the trending search #Fishing Village Anchor to tear apart the sea monster with his hands. Decipher "Casting a net in two months will bring disaster" (Rule 2): Use the [Mermaid Oil Lamp] rewarded by millions of viewers to illuminate the hidden third blood moon.
It was revealed that the village chief used living people to raise pearls (the scene where the clams disembowelled the pearls to obtain the pearls) was wanted by the Tide Guard.