And there's his explanation of the "Bing Bing" delinquent girls concept (I assume he's speaking of the second attempt (February 2013) to promote the track [EDIT: vid taken off YouTube but here's what's MAYBE a similar performance 12 days later on Show Champion]):

That time, a message I sent to one of the managers on Kakao Talk is floating on the internet. The manager had asked me what to do on stage, and wanted me to respond with instructions. I just replied "Chew gum. No matter what, it would have been better than previously. If there's any problems, I would handle it. However, do not chew during the rehearsal, only chew while live" (laughs).

And we really did it. The PD was very unhappy with that initially, and the camera directors were quite unsure what to do. But because of that, the realtime search terms ranking rose, and people were praising me asking me how did I think of that.