Jaeleen and Kyorina are sister that have been mermaids their entire lives. The live in the sea in their pod, with their father and always do as told, following the #1 rule in the pod, don't go near any humans and stay away from land. Going against their fathers rules, the two sisters fall in love with local surfers and begin to watch them in secret.
But after hearing of an arranged marriage with two merman that they don't love at all, the two daughters go against their father's wishes. They set out to be with the ones they actually love, Mark and Jungkook.... Even if it means getting legs and going to the surface.