The shark princess Su Wan went ashore in search of the lost "Tide Pearl" (the key to maintaining the shark's sea area), but because she could not speak (the shark needed to seal her voice when landing), she met Luo Xuan, a human boy who could understand her voice. Luo Xuan helped her search for beads. On the way, Su Wan used Mermaid Tears to help him cure his eye disease, and the two gradually fell in love. When the villain wanted to steal the pearl and destroy the sea, Su Wan unblocked the sound to awaken the power of the tide, while Luo Xuan used his mind-hearing ability to see through the conspiracy, and finally protected the sea and love.
