In the desperate conditions of a typhoon, young fisherman Lin Yue unexpectedly discovers a thousand-year-old underwater Dragon Palace. Armed with his father's nautical logbook and his innate talent for reading the sea and identifying fish, he breaks with his third uncle, Song Tiegen, who has exploited his family for fifteen years, and sets sail against the odds in an old fishing boat. Following the clues his father left behind, he uncovers the truth about a shipwreck fifteen years ago and maneuvers between foreign salvage fleets and the mysterious mastermind known as the Sea Dragon King. Along the way, he witnesses the brotherhood forged through thirty years of undercover work and unravels conspiracy after conspiracy. In the end, he brings the real culprit to justice, rises to become the Fishing King of Binhai, leads local fishermen in establishing a cooperative, and protects the blue sea.