Description: Kim Taeyeon, Choi Sooyoung, and Amber Liu are the Top Agents of Starlight Academy as they recieved a dangerous mission from their Boss. But during their mission, they met 3 beautiful Ladies, Tiffany Hwang, Jessica Jung, and Krystal Jung who they didn't know the Heiress. And one thing that they know is that slowly the Heiresses are changing their lives by turning it upside down.

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Characters: Kim Taeyeon, Jessica Jung, Tiffany Hwang, Choi Sooyoung, Amber Liu, and Krystal Jung.
       f(x)= Amber and Krystal
       SNSD= Taeyeon, Jessica (Former), Tiffany, and Sooyoung