Under The Sea is a family cooperation that takes care of sealife and shows awareness the Jeon Brother's Hoseok (Jhope) and his younger brother Jungkook are two main specialist in marine biology at their underwater/above water research center along with their father. Jungkook is 24 years old and a striving marine biologist his job anf family are his priority in life especially his daughter 5 year old Xiaomi (Rain) he had when he was 19 years old with a guy he thought was the love of his life left him and his child on their own eversince he closed his heart on love and never wants to open that door once more until one Park Jimin walks into his life a very popular marine biologist and ocean specialist.