Kim Taeyeon

- Interior designer

- Sunny's partner in SunYeon's art gallery

- Wife of Tiffany 

Tiffany Hwang

- house wife

- Wife of Taeyeon

- Kyungsan's biological mother

Sooyoung

- Math teacher in Eastern High school

- Taeyeon's big sister

- girl friend of Donghae

Sunny

- Taeyeon's bestfriend and partner

- Yuri's cousin

- Seohyun's playtime partner

Yoona

- one of The Bad Girls

- Tiffany's bestfriend

- Yuri's girlfriend

Yuri

- English teacher in North National High school

- Yoona's girl friend

- Sooyoung's bestfriend

Seohyun

- one of The Bad Girls

- Sunny's playtime partner

- Tiffany's bestfriend

Jessica

- The leader and the main vocalist in The Bad Girls

- one of Taeyeon's ex

- Hyoyeon's partner

Hyoyeon

- Main dancer in The Bad Girls

- Yoona's mentor

- Jessica's  partner