To identify if your desired IDOL is still AVAILABLE you should see the markers of it
Example:
Lee Taemin(R) /means RESERVED
Jo Kwon(--)/ means TAKEN
MALE IDOLS
2PM--- Wooyoung/Taecyeon/Junsu/Nichkhun/Junho/Chan Sung
B1A4--- Baro/Sandeul/Gongchan/CNU/Jinyoung
CN Blue---- Yonghwa/Minhyuk/Jonghyun/Jongshin
EXO-K ----- Baekhyun/Suho/Kai(R)/Sehun/D.O./Chanyeol
EXO-M ---- Luhan/Kris/Xiumin/Lay/Chen/Tao
Super Junior---- Leeteuk/Heecheul/Donghae/Hangeng/Yesung/Kangin/
Shindong/Sungmin/Eunhyuk/Siwon/Ryeowook/Kibum/Henry/Zhou Mi
SHINee--- Taemin(R)/Key/Minho(R)/Onew/Jonghyun
UKiss--- Kiseop/ Eli/ AJ/ Hoon/Kevin/Dongho/Kibum/Alexander
MBLAQ--- Thunder/G.O/Seungho/Mir/Lee Joon
JJ Project--- JR/JB
TVXQ---- Changmin/Yunho
FEMALE IDOLS
Girls' Generation--- Sunny/YoonA/Yuri(--)/HyoYeon/Tiffany/Taeyeon/
Jessica/Sooyoung/Seohyun(R)
F(x)--- Krystal/Amber/Sulli/Victoria/Luna
2ne1--- Minzy/Bom/Dara/CL
4Minute--- HyunA/Sohyun/Gayoon/Jihyun/Jiyoon
Miss A--- Suzy/Jia/Fei/Min
T-Ara--- Soyeon/Jiyeon/Hwayoung/Dani/Boram/Hyomin/Eunjung/Qri/Ahreum
Hello Venus---- Ara/Yoonjo/Yooyoung/Alice/Nara/Lime
Sistar---- Hyolyn/Bora/Dasom/Soyu
SOLOIST
Psy/Juniel/Ailee/K.Will/BoA/Jay Park/Se7en
ACTORS and ACTRESSES
Rain/Lee Minho/Oh Ji-ho/Kim Minjung/Yoo Ah-in/Shin Se-kyung/Lee Je-hoon
