On September 16 episode of MBC's television show 'South Korean Foreigners', Sunny, her fellow member Hyoyeon, Kei and Mijoo made a guest appearance.
Kei and Mijoo told them, "When we had just made debut, we wanted to be like Girls' generation. You are our role model."
Then, Kei asked, "What's your secret to your long-lasting popularity?"
She continued, "The most important thing is to meet guys in secret. Always meet them secretly. I'll tell you more details later when we are alone."
Hyoyeon added, "It's also important that you take good care of your health."
(SBS Star)