I think Yoona is in a relationship with Siwon, they are so stiff with each other if they're in public. they both are always engaged in the same work, aren't? even before their debut. but why they still always awkward when being together? i do not see this stiffness on her while being with SM other members, only with Siwon, Yoona will be different.
it also happens to Siwon..
i do not know what really happened, but i feel that they want to hide their togetherness, to hide closeness them in the real life, and also to hide something was very confidential in relationship between them.. i'm pretty sure that they are real couple and really close each other..
YoonWon >> Hidden Couple
Park yoochun from TVXQ/JYJ
micky is yoona first love , both of them meet when they're training in SM entertiment !!
Kim jaejoong from TVXQ have love line with jessica jung from SNSD . kim junsu ( TVXQ ) with Kim taeyeon ( SNSD ) .
jung yunho ( TvXQ leader ) rumored have love line with Go Ara for changmin , there so many netizen said that Max changmin fall in love with Choi sooyoung from SNSD !! thanks ( my opionion )
i don't remember where i saw it but i saw yoona and all snsd were somewhere on a television show and then someone asked her is the rumors about some guy and yoona are correct and they are dating then, both of (that person were there too) them agreed AND for who wondered it wasn't Gang Keun Suk
I some kind of ship YoonWook (Yoona Ryeowook) coz they always take selca together. And one of the information is 'SUJU member revealed their choice for I got a boy (SNSD)' and 'SNSD revealed their choice for Break Down (SUJU). And Ryeowook chose Yoona,Yoona chose Ryeowook. But Donghae didn't choose Yoona,Yoona didn't choose Donghae.
(I ship G-Yoon(GD), YoonRi (seungri,)YoonHae and YoonTaec and YoonWook)