Liu Po, the son of King Shark of the Deep Sea, and Jiao Mo, adopted by King Shark, are an unmarried couple.
Lucha, the illegitimate son of King Shark and a human woman, was ostracized when he was born on the shore and turned into a shark hunter.
When Jiao Mo went out to sea, he met Liu Sha by chance and impressed him with his kindness. Liu Sha secretly fell in love with him.
Liu Po retrieves Jiao Mo and brings Liu Sha back to the sea. King Shark used his secret power to purify his human bloodline and made him the second prince.
In the end, Liusha reconciled with his father, witnessed the wedding of Liupo and Jiaomo, and the family was happy.
