It's been revealed that Girls' Generation's Hyoyeon and ZE:A's  Kwanghee were good friends in the past.

Kwanghee guested on the July 7th broadcast of KBS 2TV's 'Invincible Youth 2', and he and Hyoyeon revealed details about their past friendship.

Hyoyeon stated, "Before [his debut], Kwanghee and I hung out a couple of times and had meals together. But after Kwanghee debuted with ZE:A, he acted like he didn't know me."

Kwanghee explained, "I saw Hyoyeon in the waiting room [backstage], but Girls' Generation looked [intimidating]. That's why it was hard for me to approach her. I can chat with her now, but back then, [Girls' Generation] was too busy."

She then added, "I was so disappointed that I went around insulting him," causing laughter.

Source: Newsen via Nate