Idol School, primary debut ability test. BLACKPINK's "whistle" (WHISTLE) is also included in the assignment song. YGformer memberLee Impression of the same group who heard Seo Yeon practice.

* PRODUCE 101 Lee Hae In: Complete YG, make the strongest pair Seowoo.

* YGformer memberLee Hae In principal: The color of YG attached to me is a problem. .