In Baisha Bay, young girl Shen Xi accidentally rescues an injured white dolphin, only for it to transform into the silver-haired youth Lansheng. To search for sunken seabed silver, greedy ship merchants use Shen Xi as bait, forcing Lansheng to emit three reverse cries capable of disrupting shipping routes. When the third cry sounds, thick fog seals the sea, a hundred ships become lost, and the entire waters have no return path. Facing betrayal by family and millions in wealth, Shen Xi chooses to protect life. She beats the homecoming drum, summoning a pod of white dolphins to pave a silvery-white route, and cuts the sunken silver ropes on the endangered ship. After the storm, relying on her courage and sense of responsibility, she becomes Baisha Bay's first female captain, guarding the lighthouse for all lost voyagers.