Lu Haisheng, a treasure-hunting expert from Qingjiao Port, relies on ancestral skills to help his childhood friend Qi Mancang become the treasure-hunting king, only to be betrayed, cast out, and have his prescription stolen. To pay for his father's medical treatment, he sails an old boat into the perilous Black Tide Trench, repels deep-sea monsters, and salvages lost treasures worth hundreds of millions, achieving a stunning counterattack. Qi Mancang and his wife steal a fake prescription and take desperate risks, ultimately summoning sea monsters in a storm that destroys their ship and claims their lives. Lu Haisheng ascends as the new treasure-hunting king, sailing toward even more dangerous waters.