Five years ago, the Sea Lord Triton was saved by an ordinary human girl, Naomi, after being wounded by deep-sea monsters. To repay her warmth, he hid his divinity and became a humble firefighter, secretly paving her career path. On their fifth anniversary, after slaying a sea beast, Triton prepares to propose—only to be publicly dumped. Naomi, chasing a Crowley Group executive, tramples his heart, mocking a mere firefighter's status.
Meanwhile, Marlene Crowley, CEO and Captain, is in despair. Monsters are ravaging her fleet, and her inheritance is locked unless she marries. After Triton saves her from a raging fire, she proposes a contract marriage to this ordinary stranger. Little does she know, she has just wed the supreme ruler of the oceans. The tides are about to turn for those who betrayed him.