The first season of Got You! Wonderland. 
Note: Chapter count includes 3 side stories

While on a school trip aboard a ship, Teacher Ji-Han has a strange dream about a goat man. He steps onto the deck to clear his head, only to be swept away by a huge wave. When he comes to, he finds himself on "Goats Island," where he meets Sea Bass and his friends—who all can’t remember a thing. As Ji-Han and Sea Bass fall head over hooves for each other, it becomes clear that their friends are “kidding” around with the truth, leaving Ji-Han to wonder what billy-big secrets they’re hiding. (Source: Tapas)

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