BTS little mermaid

y/n human who can transform to a mermaid y/n have a secret power she lost her brothers when she was 3 years old kim's family kim's family lost their dearest sister already 13 years old they lost their sister but they never leave hope, since they lost their sister jungkook always fake smile cause he lost his energy kim's daughter is jungkook twin. Let's see what happens when they meet each other