I just found this link in youtube, so I search for the original source. This is an ad for UCC game club audition starring Kim Tae-Won. Click here.
The caption at the end of the video says “이젠 꿈을 기타로 연주한다”, meaning “now ‘play’ your dream using the guitar” ^_^
It’s really awesome to see him acting on the guitar. I swear he did just as great on a live stage!
Here’s the proof: click here. ^_^