'm YoonA's fanboy and it's not about her looks.
Although she is very beautiful. look at byuntae's answers she says Yoona is not pretty then goes on and says "sm picked her for her looks".
I like YoonA because she's funny and bright. Her ability to make someone's day by her jokes is a talent too. people get sad at times, i do too, but then when I watch snsd, they brighten up my mood. Not every idol can do that, you know. I don't watch dramas , i don't know about her acting. but her dancing is great.