Everyone has heard of The Little Mermaid's story. But no one has heard of her younger sister's story. Her sister that was born after her death. Growing up hearing of her sister's horrifying story, she promised herself she'd never do anything such as her sister for love. But everything changes when her home, Atlantis is attacked by Sirens. Her father grants her some legs and casts her to the shores of Macau, China. Her tail is visible every midnight, also when her legs get wet.

Song Meili (You)

- 23 years old
- the mermaid

Lu Han

- 26 years old
- future heir of "Triton"
- the playboy

Wu Yifan

- 25 years old
- future heir of "Wu Diamonds" 
- the y brain

Zhang Yixing

​- 24 years old
- future heir of "Zhang Fashion Thread"
- kind and soft-hearted one

Huang Zitao

- 23 years old
- future heir of "Huang Sports Wear"
- the childish one

Wu Xuanyi

- 23 years old
- future heiress of "Wu Cosmetics"
- the princess