Huh... after having read chapter zero, the series description seems quite inaccurate indeed. The omniscient narrator should know that the protag is actually a woman, she wasn't immediately swept off her feet by mutual feelings for the princess, and JD Niu doesn't seem to be her name either.
Ah well, that minor gripe aside, I thought for a second on seeing the bishonen staffing the undersea palace that this had been mistagged and was a BL story instead, an amusing misconception in hindsight, and I now look forward to see where the disaster lesbian failwife princess dragon takes her wooing next.