According to Sunny, she's revealed a spoiler for Girls' Generation's upcoming concert, 'Girls' Generation 4th Tour - Phantasia - in Seoul'.

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Sunny posted the above photo to Instagram on November 19 with the message, "Spoiler! You miss me, right? You want to visit, right? There really are only two days left until Girls' Generation's concert." In the photo, she seems to be wearing a white dress, which may be something she'll wear at the concert.

Girls' Generation's 'Phantasia' concert is being held at Seoul's Olympic Stadium on November 21-22. 

What kind of spoiler do you think Sunny's talking about?