In which Seungkwan, Seokmin and Soonyoung have a secret life. Because high school is never easy, but it's even harder when you're half merman. One minute you're a student with average grades, annoying siblings and a hopeless crush on the school's heartthrob/your best friend/your sworn enemy etc, and 10 seconds after you touch water you're a merman who swims around with dolphins, can breathe underwater and can swim a thousand miles in a few minutes. Sounds cool, huh? But things don't always go as planned... 'We can't even moisturize without growing a fishtail!' - Seungkwan 'It was my idea so it's obviously a good one.' - Hoshi 'Cool, we just lost our last functioning braincell.' - Seokmin 'You three wouldn't survive a day without my help.' - Wonwoo Seventeen Mermaid Au based on the series H2O Starring: BooSeokSoon Underrated bxb ships Might contain trigger warnings (read note at the beginning) Started: 22/08/22 Status: ongoing