Fisherman Yu Fei is burdened with his late father's old debts. After being tricked by the village chief into surrendering his fishing boat and then being dumped by his girlfriend, he unexpectedly awakens the Sea-Swallowing Pearl, gaining extraordinary ocean-sensing abilities and physical strength. He renovates his old boat, Fair Wind, and catches an incredibly valuable bluefin tuna. Meanwhile, he gradually uncovers the truth behind his father's death at sea twenty years ago. Standing against the village chief, who is colluding with unscrupulous businessman Lu Hongming, Yu Fei investigates smuggling crimes and uncovers the ancient secrets of ironwood and the original Sea-Swallowing Pearl. Caught between various criminal forces, he works with law enforcement officials to gather evidence, protects an ancient shipwreck site beneath the sea, and vows to clear his father's name and obtain justice for him.