Young man Lin Hai is framed by his own uncle and pushed into the open sea. On the verge of death, he is rescued by the mermaid maiden Ning Xi. Ning Xi commands the creatures of the sea to help, allowing Lin Hai to harvest a massive amount of precious seafood and escape death. Utilizing shark scales, Lin Hai takes back the fishing boat left by his father, accidentally discovers the underwater conspiracy hidden by Hanyang Group, and with the assistance of the mermaid, confronts crisis after crisis step by step, determined to uncover the full truth behind his father's mysterious disappearance.