Im Yoon A - 23 years old, parents died four years ago, half-sister, Song Ji Hyo, works as the boss in a small cafe called 'Sweet Dreams', join a K-pop group named Girls' Generation.

Jessica Jung - 24 years old, came from a wealthy family, a member of Girls' Generation, falls in love with Im Yoon A when she first joined the group.

Kwon Yuri - 24 years old, came from a wealthy family, a member of Girls' Generation, had a crush on Im Yoon A through a game.

Tiffany Hwang - 24 years old, came from a moderate family, a member of Girls' Generation, liked Yuri since she joined the group but was afraid to confess.