Haha Netizenbuzz translated it much nicely. She didn't just say he was "soso"
To be specific, she actually said "he's only charming on the screen. He's a complete psycho once you date him"
I was totally freaked out at it too. Considering Yoona would say such a thing, he must be really weird.
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Why are people thumbing down my comment? I'm Korean so I know exactly how she said it.