My Birthday Gift Is a Merman Prince

After a night of heavy drinking, a designer named on the birthday wrapping finds a merman prince waiting for him as a present, only to discover the stranger is a diplomatic guest from the sea. The frosty royal turns out to be surprisingly clingy once the door closes, and the two tumble into a deep attachment. When he refuses an arranged marriage, he must also protect his beloved through a professional crisis and a tsunami that threatens everything they have built.