it is because of yoona's wig accident on pkl's starry night radio. when her clip on bangs suddenly flew off or something like that. lol. you can check out this thread: http://soshified.com...w...=38720&st=0
it was there in the first place. ^^
if you have some questions, don't hesitate to post it. i'll try to answer them. ^^
Ah! I know of that incident. Thanks for enlightening!