Someone was like "Can we take a group photo?" And the teacher said yes thats why everyone went running up to her but the teacher's kind of.... lol like I heard that Yoona came in quietly through the back door and the teacher told the students that SNSD Yoona's here and before class ended she told yoona to come up and talk about herself like wtf what a way to make anyone burdened/uncomfortable. Yoona ended up signing + taking photos for more than a hour