[All] What is this awkward expression while watching Sungchan's fancam?

I'm watching Boom Boom Base's fancam and my heart is racing from the introduction. It's a shame to only watch it once, so I replayed it and it said it was the scene I watched the most. I guess people's perception is all the same. Watching the stage on TV is nice, but watching the fancams of each member seems new and good.