Idol School, YGformer memberLee Seo Yeon and JYPformer member Park · JiWooon, SMformer member So · Hyerin looks back on the trainee era. An evident testimony about 'gender relations'.

* YG: Men and women can not meet each other. I do not even know who is there.

* SM: Gender and female trainees may meet, but there is no exchange.

* JYP: Practice freely together. .