Im Yoona alives a simple and quiet life until four incredibly gorgeous guys came out of the blue and made everything as chaotic as possible.

Im Yoona

19 years old

Attends SM Academy and major in dance and minor in singing and acting

Best Friend of Yuri

Lee Donghae

20 years old

Attends SM Academy major in dancing and minor in singing and acting

Best Friend of Kibum

Baseball player

Kim Kibum

20 years old

Attends SM Academy majors in acting minors in singing and dancing

Best friend of Donghae

Soccer player

Jang Geun Suk

19 years old

Attends Lee School of Performing Arts majors in guitar, acting and piano, minors in singing and dancing

Close friends with Yoona and Taecyon

Piano and guitar player and same band with Yoona

Ok Taecyon

19 years old

Attends Lee School of Performing Arts majors in singing and dancing, minors in drums and photography

Close friends with Yoona and Geun Suk and Yuri

Plays guitar and same band as Yoona

Yuri's ex-boyfriend

Kwon Yuri

20 years old

Attends SM Academy major in dancing amd modelling, minor in acting

Yoona's best friend

Taecyon's ex-girlfriend

Choi Siwon

Yoona's older cousin

23 years old

Plays drums and same band as Yoona

Attends Lee School of Performing Arts majoring in acting minoring in singing and dancing

So Eun So

19 years old

Queengka of SM Academy majoring in acting

In love with Donghae

Hates Yoona ever since kindergarten when Yoona got all the roses from their male classmates on Valentine's Day.

Members of the band:

Yoona

Taecyon 

Jang Geun Suk

Siwon