http://www.youtube.com/watch?v=mVcpTBDg6VU&feature=player_embedded

Start at 1:05. Sungmin must have been watching Sunny from afar and noticed she was a bit bored. So when their gazes met, Sungmin wanted to cheer her up. Ajhfgbskhf. And after that, Sunny was talking to Yoona, but you can still see Sungmin still watching them.