Young fisherman Gu Yuanzhou rescues corporate president Lin Qingyao from a plotted attack at sea, and the two pretend to be fiancés to jointly investigate the truth. Facing elder Lin Wancheng's power-grabbing conspiracy, frame-ups, and port-blocking obstruction, Gu Yuanzhou defies tyranny, braving a typhoon to deep-dive and salvage the black box, uncovering the heroic truth of the "Changfeng" sacrificing itself to save lives ten years ago. Ultimately, relying on the rules of justice and civilian search-and-rescue forces, the two bring the villains to justice, clearing their wronged fathers, safeguarding the harbor's peace, and harvesting a fulfilling true love.