Back in July, Pledis Entertainment announced that they were searching for After School's ninth member. After an overwhelming response of applicants, the agency narrowed it down to new member Yiyoung, and the new girl made her stunning debut through the 2010 MBC Gayo Daejun. Yiyoung made her entry with a special guitar introduction mid-way through After School's 'Bang!' performance, and immediately caught everyone's attention with her charismatic talent. Shortly after, a video of Yiyoung playing the guitar was uploaded onto the pledisartist Youtube channel. With her spectacular guitar playing, she has already gathered many fans. In case you missed it, you can also check out her pre-debut guitar video here. [Thanks to everyone who sent this in.]