The Merman's Lament - Wangxian

Lan Zhan is one of the two merman princes of the underwater kingdom. He is fascinated with the human world, but his uncle and king Lan Qiren is against it.
One day, he travels to the surface and saves prince Wei Ying from drowning after his ship sinks.
From then on, Lan Zhan will fall in love with him and do anything to be with him.

Credits to user butleronice on Tumblr for the illustration on the cover