In a modern fishing port, senior fisherman Qi Wangchao is unfairly shortchanged on his share by boat owner Wu Fuhai and forced to leave the boat. He exhausts his savings to lease the No. 31 broken-boat reef, a spot no one dares to enter. Piloting his old boat "Old Bones" and relying on his exceptional tidal and sea condition expertise, he ventures into the reef to fish, successively resolving multiple tests such as resource blockades and malicious suppression, exposing industry chaos, and ultimately integrating the fleet to establish new rules, leading his peers to make a living at sea through genuine skill.