AU, Donghae is a merman who has been held in abusive captivity all his life; part of a freak show that travels the globe. When Donghae is injured, he’s rescued from the freak show by a civilian named Eunhyuk. Keeping Donghae safe in his bathtub, Eunhyuk cares for the merman as they learn about one another and develop a unique relationship. Donghae/Eunhyuk, minor Eunhyuk/Heechul